diff --git a/api-generator/components/panelmenu.js b/api-generator/components/panelmenu.js
index 506ac8c1f..b0cd7267f 100644
--- a/api-generator/components/panelmenu.js
+++ b/api-generator/components/panelmenu.js
@@ -4,6 +4,12 @@ const PanelMenuProps = [
         type: "array",
         default: "null",
         description: "An array of menuitems."
+    },
+    {
+        name: "expandedKeys",
+        type: "array",
+        default: "null",
+        description: "A map of keys to represent the expansion state in controlled mode."
     }
 ];
 
diff --git a/api-generator/components/tree.js b/api-generator/components/tree.js
index 81e902a76..550c670e7 100644
--- a/api-generator/components/tree.js
+++ b/api-generator/components/tree.js
@@ -9,7 +9,7 @@ const TreeProps = [
         name: "expandedKeys",
         type: "array",
         default: "null",
-        description: "A map of keys to represent the state of the tree expansion state in controlled mode."
+        description: "A map of keys to represent the expansion state in controlled mode."
     },
     {
         name: "selectionMode",
diff --git a/src/components/panelmenu/PanelMenu.d.ts b/src/components/panelmenu/PanelMenu.d.ts
index 31799151e..7e7fdf50e 100755
--- a/src/components/panelmenu/PanelMenu.d.ts
+++ b/src/components/panelmenu/PanelMenu.d.ts
@@ -1,5 +1,6 @@
 interface PanelMenuProps {
     model?: any[];
+    expandedKeys?: any;
 }
 
 declare class PanelMenu {
diff --git a/src/components/panelmenu/PanelMenu.vue b/src/components/panelmenu/PanelMenu.vue
index fcfb6cf82..e1995d7e9 100755
--- a/src/components/panelmenu/PanelMenu.vue
+++ b/src/components/panelmenu/PanelMenu.vue
@@ -20,10 +20,11 @@
                     <component v-else :is="$slots.item" :item="item"></component>
                 </div>
                 <transition name="p-toggleable-content">
-                    <div class="p-toggleable-content" v-show="item === activeItem"
+                    <div class="p-toggleable-content" v-show="isActive(item)"
                         role="region" :id="ariaId +'_content' " :aria-labelledby="ariaId +'_header'">
                         <div class="p-panelmenu-content" v-if="item.items">
-                            <PanelMenuSub :model="item.items" class="p-panelmenu-root-submenu" :template="$slots.item" />
+                            <PanelMenuSub :model="item.items" class="p-panelmenu-root-submenu" :template="$slots.item" 
+                                :expandedKeys="expandedKeys" @item-toggle="updateExpandedKeys" />
                         </div>
                     </div>
                 </transition>
@@ -38,10 +39,15 @@ import {UniqueComponentId} from 'primevue/utils';
 
 export default {
     name: 'PanelMenu',
+    emits: ['update:expandedKeys'],
     props: {
 		model: {
             type: Array,
             default: null
+        },
+        expandedKeys: {
+            type: null,
+            default: null
         }
     },
     data() {
@@ -68,10 +74,25 @@ export default {
             else
                 this.activeItem = item;
 
+            this.updateExpandedKeys({item: item, expanded: this.activeItem != null});
+        
             if (item.to && navigate) {
                 navigate(event);
             }
         },
+        updateExpandedKeys(event) {
+            if (this.expandedKeys) {
+                let item = event.item;
+                let _keys = {...this.expandedKeys};
+
+                if (event.expanded)
+                    _keys[item.key] = true;
+                else
+                    delete _keys[item.key];
+
+                this.$emit('update:expandedKeys', _keys);
+            }
+        },
         getPanelClass(item) {
             return ['p-panelmenu-panel', item.class];
         },
@@ -83,7 +104,7 @@ export default {
             return ['p-menuitem-icon', item.icon];
         },
         isActive(item) {
-            return item === this.activeItem;
+            return this.expandedKeys ? this.expandedKeys[item.key] : item === this.activeItem;
         },
         getHeaderClass(item) {
             return ['p-component p-panelmenu-header', {'p-highlight': this.isActive(item), 'p-disabled': item.disabled}];
diff --git a/src/components/panelmenu/PanelMenuSub.vue b/src/components/panelmenu/PanelMenuSub.vue
index 74a306dcc..069ea6fab 100755
--- a/src/components/panelmenu/PanelMenuSub.vue
+++ b/src/components/panelmenu/PanelMenuSub.vue
@@ -18,8 +18,9 @@
                 </template>
                 <component v-else :is="template" :item="item"></component>
                 <transition name="p-toggleable-content">
-                    <div class="p-toggleable-content" v-show="item === activeItem">
-                        <PanelMenuSub :model="item.items" v-if="visible(item) && item.items" :key="item.label + '_sub_'" :template="template" />
+                    <div class="p-toggleable-content" v-show="isActive(item)">
+                        <PanelMenuSub :model="item.items" v-if="visible(item) && item.items" :key="item.label + '_sub_'" :template="template" 
+                            :expandedKeys="expandedKeys" @item-toggle="$emit('item-toggle', $event)" />
                     </div>
                 </transition>
             </li>
@@ -31,6 +32,7 @@
 <script>
 export default {
     name: 'PanelMenuSub',
+    emits: ['item-toggle'],
     props: {
 		model: {
             type: null,
@@ -39,6 +41,10 @@ export default {
         template: {
             type: Object,
             default: null
+        },
+        expandedKeys: {
+            type: null,
+            default: null
         }
     },
     data() {
@@ -65,6 +71,8 @@ export default {
             else
                 this.activeItem = item;
 
+            this.$emit('item-toggle', {item: item, expanded: this.activeItem != null});
+
             if (item.to && navigate) {
                 navigate(event);
             }
@@ -76,7 +84,7 @@ export default {
             return ['p-menuitem-link', {'p-disabled': item.disabled}];
         },
         isActive(item) {
-            return item === this.activeItem;
+            return this.expandedKeys ? this.expandedKeys[item.key] : item === this.activeItem;
         },
         getSubmenuIcon(item) {
             const active = this.isActive(item);
diff --git a/src/views/menumodel/MenuModel.vue b/src/views/menumodel/MenuModel.vue
index 248c67172..c616f9f10 100755
--- a/src/views/menumodel/MenuModel.vue
+++ b/src/views/menumodel/MenuModel.vue
@@ -110,6 +110,12 @@ const items: [
                                 <td>null</td>
                                 <td>Style class of the menuitem.</td>
                             </tr>
+                            <tr>
+                                <td>key</td>
+                                <td>object</td>
+                                <td>null</td>
+                                <td>Unique identifier of an item.</td>
+                            </tr>
                         </tbody>
                     </table>
                 </div>
diff --git a/src/views/panelmenu/PanelMenuDemo.vue b/src/views/panelmenu/PanelMenuDemo.vue
index 5bab055d4..dbcdcd4f0 100755
--- a/src/views/panelmenu/PanelMenuDemo.vue
+++ b/src/views/panelmenu/PanelMenuDemo.vue
@@ -10,7 +10,15 @@
 
         <div class="content-section implementation">
             <div class="card">
-                <PanelMenu :model="items" />
+               <h5>Default</h5>
+               <PanelMenu :model="items" />
+
+               <h5>Programmatic</h5>
+               <div class="p-mb-3">
+                    <Button type="button" icon="pi pi-plus" label="Expand All" @click="expandAll" class="p-mr-2" />
+                    <Button type="button" icon="pi pi-minus" label="Collapse All" @click="collapseAll" />
+                </div>
+               <PanelMenu :model="items" v-model:expandedKeys="expandedKeys" />
             </div>
         </div>
 
@@ -24,128 +32,164 @@ import PanelMenuDoc from './PanelMenuDoc';
 export default {
     data() {
         return {
-            items: [
-                {
-                   label: 'File',
-                   icon:'pi pi-fw pi-file',
-                   items: [
-                      {
-                         label: 'New',
-                         icon:'pi pi-fw pi-plus',
-                         items: [
-                            {
-                               label: 'Bookmark',
-                               icon:'pi pi-fw pi-bookmark'
-                            },
-                            {
-                               label: 'Video',
-                               icon:'pi pi-fw pi-video'
-                            }
-                         ]
-                      },
-                      {
-                         label: 'Delete',
-                         icon:'pi pi-fw pi-trash'
-                      },
-                      {
-                         label: 'Export',
-                         icon:'pi pi-fw pi-external-link'
-                      }
-                   ]
+            expandedKeys: {},
+            items: [{
+                    key: '0',
+                    label: 'File',
+                    icon: 'pi pi-fw pi-file',
+                    items: [{
+                            key: '0_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-plus',
+                            items: [{
+                                    key: '0_0_0',
+                                    label: 'Bookmark',
+                                    icon: 'pi pi-fw pi-bookmark'
+                                },
+                                {
+                                    key: '0_0_1',
+                                    label: 'Video',
+                                    icon: 'pi pi-fw pi-video'
+                                }
+                            ]
+                        },
+                        {
+                            key: '0_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-trash'
+                        },
+                        {
+                            key: '0_2',
+                            label: 'Export',
+                            icon: 'pi pi-fw pi-external-link'
+                        }
+                    ]
                 },
                 {
-                   label: 'Edit',
-                   icon:'pi pi-fw pi-pencil',
-                   items: [
-                      {
-                         label: 'Left',
-                         icon:'pi pi-fw pi-align-left'
-                      },
-                      {
-                         label: 'Right',
-                         icon:'pi pi-fw pi-align-right'
-                      },
-                      {
-                         label: 'Center',
-                         icon:'pi pi-fw pi-align-center'
-                      },
-                      {
-                         label: 'Justify',
-                         icon:'pi pi-fw pi-align-justify'
-                      }
-                   ]
+                    key: '1',
+                    label: 'Edit',
+                    icon: 'pi pi-fw pi-pencil',
+                    items: [{
+                            key: '1_0',
+                            label: 'Left',
+                            icon: 'pi pi-fw pi-align-left'
+                        },
+                        {
+                            key: '1_1',
+                            label: 'Right',
+                            icon: 'pi pi-fw pi-align-right'
+                        },
+                        {
+                            key: '1_2',
+                            label: 'Center',
+                            icon: 'pi pi-fw pi-align-center'
+                        },
+                        {
+                            key: '1_3',
+                            label: 'Justify',
+                            icon: 'pi pi-fw pi-align-justify'
+                        }
+                    ]
                 },
                 {
-                   label: 'Users',
-                   icon:'pi pi-fw pi-user',
-                   items: [
-                      {
-                         label: 'New',
-                         icon:'pi pi-fw pi-user-plus',
+                    key: '2',
+                    label: 'Users',
+                    icon: 'pi pi-fw pi-user',
+                    items: [{
+                            key: '2_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-user-plus',
 
-                      },
-                      {
-                         label: 'Delete',
-                         icon:'pi pi-fw pi-user-minus',
-                      },
-                      {
-                         label: 'Search',
-                         icon:'pi pi-fw pi-users',
-                         items: [
-                            {
-                               label: 'Filter',
-                               icon:'pi pi-fw pi-filter',
-                               items: [
-                                  {
-                                     label: 'Print',
-                                     icon:'pi pi-fw pi-print'
-                                  }
-                               ]
-                            },
-                            {
-                               icon:'pi pi-fw pi-bars',
-                               label: 'List'
-                            }
-                         ]
-                      }
-                   ]
+                        },
+                        {
+                            key: '2_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-user-minus',
+                        },
+                        {
+                            key: '2_2',
+                            label: 'Search',
+                            icon: 'pi pi-fw pi-users',
+                            items: [{
+                                    key: '2_2_0',
+                                    label: 'Filter',
+                                    icon: 'pi pi-fw pi-filter',
+                                    items: [{
+                                        key: '2_2_0_0',
+                                        label: 'Print',
+                                        icon: 'pi pi-fw pi-print'
+                                    }]
+                                },
+                                {
+                                    key: '2_2_1',
+                                    icon: 'pi pi-fw pi-bars',
+                                    label: 'List'
+                                }
+                            ]
+                        }
+                    ]
                 },
                 {
-                   label: 'Events',
-                   icon:'pi pi-fw pi-calendar',
-                   items: [
-                      {
-                         label: 'Edit',
-                         icon:'pi pi-fw pi-pencil',
-                         items: [
-                            {
-                               label: 'Save',
-                               icon:'pi pi-fw pi-calendar-plus'
-                            },
-                            {
-                               label: 'Delete',
-                               icon:'pi pi-fw pi-calendar-minus'
-                            }
-                         ]
-                      },
-                      {
-                         label: 'Archieve',
-                         icon:'pi pi-fw pi-calendar-times',
-                         items: [
-                            {
-                               label: 'Remove',
-                               icon:'pi pi-fw pi-calendar-minus'
-                            }
-                         ]
-                      }
-                   ]
+                    key: '3',
+                    label: 'Events',
+                    icon: 'pi pi-fw pi-calendar',
+                    items: [{
+                            key: '3_0',
+                            label: 'Edit',
+                            icon: 'pi pi-fw pi-pencil',
+                            items: [{
+                                    key: '3_0_0',
+                                    label: 'Save',
+                                    icon: 'pi pi-fw pi-calendar-plus'
+                                },
+                                {
+                                    key: '3_0_0',
+                                    label: 'Delete',
+                                    icon: 'pi pi-fw pi-calendar-minus'
+                                }
+                            ]
+                        },
+                        {
+                            key: '3_1',
+                            label: 'Archieve',
+                            icon: 'pi pi-fw pi-calendar-times',
+                            items: [{
+                                key: '3_1_0',
+                                label: 'Remove',
+                                icon: 'pi pi-fw pi-calendar-minus'
+                            }]
+                        }
+                    ]
                 }
-             ]
+            ]
+        }
+    },
+    methods: {
+        expandAll() {
+            for (let node of this.items) {
+                this.expandNode(node);
+            }
+
+            this.expandedKeys = {
+                ...this.expandedKeys
+            };
+        },
+        collapseAll() {
+            this.expandedKeys = {};
+        },
+        expandNode(node) {
+            if (node.items && node.items.length) {
+                this.expandedKeys[node.key] = true;
+
+                for (let child of node.items) {
+                    this.expandNode(child);
+                }
+            }
         }
     },
     components: {
         'PanelMenuDoc': PanelMenuDoc
-	}
+    }
 }
 </script>
 
diff --git a/src/views/panelmenu/PanelMenuDoc.vue b/src/views/panelmenu/PanelMenuDoc.vue
index 5b27c84a8..35dee5e55 100755
--- a/src/views/panelmenu/PanelMenuDoc.vue
+++ b/src/views/panelmenu/PanelMenuDoc.vue
@@ -16,6 +16,7 @@ import PanelMenu from 'primevue/panelmenu';
 
 </code></pre>
 
+<div style="height: 400px; overflow:auto">
 <pre v-code.script><code>
 export default {
 	data() {
@@ -142,6 +143,7 @@ export default {
 }
 
 </code></pre>
+</div>
 
          <h5>Templating</h5>
          <p>PanelMenu offers content customization with the <i>item</i> template that receives the menuitem instance from the model as a parameter.</p>
@@ -152,11 +154,207 @@ export default {
     &lt;/template&gt;
 &lt;/PanelMenu&gt;
 </template>
+</code></pre>
+
+        <h5>Programmatic Control</h5>
+        <p>If the menuitem has a <i>key</i> defined, PanelMenu state can be controlled programmatically with the <i>expandedKeys</i> property that defines the keys
+            that are expanded. This property is a Map instance whose key is the key of a node and value is a boolean. Note that <i>expandedKeys</i> also supports two-way binding with the v-model directive.
+        </p>
+
+        <p>Example below expands and collapses all nodes with buttons.</p>
+<pre v-code><code><template v-pre>
+&lt;div&gt;
+    &lt;Button type="button" icon="pi pi-plus" label="Expand All" @click="expandAll" /&gt;
+    &lt;Button type="button" icon="pi pi-minus" label="Collapse All" @click="collapseAll" /&gt;
+&lt;/div&gt;
+&lt;PanelMenu :model="items" v-model:expandedKeys="expandedKeys""&gt;&lt;/PanelMenu&gt;
+</template>
+</code></pre>
+
+<div style="height: 400px; overflow:auto">
+<pre v-code.script><code>
+export default {
+    data() {
+        return {
+            items: [{
+                    key: '0',
+                    label: 'File',
+                    icon: 'pi pi-fw pi-file',
+                    items: [{
+                            key: '0_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-plus',
+                            items: [{
+                                    key: '0_0_0',
+                                    label: 'Bookmark',
+                                    icon: 'pi pi-fw pi-bookmark'
+                                },
+                                {
+                                    key: '0_0_1',
+                                    label: 'Video',
+                                    icon: 'pi pi-fw pi-video'
+                                }
+                            ]
+                        },
+                        {
+                            key: '0_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-trash'
+                        },
+                        {
+                            key: '0_2',
+                            label: 'Export',
+                            icon: 'pi pi-fw pi-external-link'
+                        }
+                    ]
+                },
+                {
+                    key: '1',
+                    label: 'Edit',
+                    icon: 'pi pi-fw pi-pencil',
+                    items: [{
+                            key: '1_0',
+                            label: 'Left',
+                            icon: 'pi pi-fw pi-align-left'
+                        },
+                        {
+                            key: '1_1',
+                            label: 'Right',
+                            icon: 'pi pi-fw pi-align-right'
+                        },
+                        {
+                            key: '1_2',
+                            label: 'Center',
+                            icon: 'pi pi-fw pi-align-center'
+                        },
+                        {
+                            key: '1_3',
+                            label: 'Justify',
+                            icon: 'pi pi-fw pi-align-justify'
+                        }
+                    ]
+                },
+                {
+                    key: '2',
+                    label: 'Users',
+                    icon: 'pi pi-fw pi-user',
+                    items: [{
+                            key: '2_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-user-plus',
+
+                        },
+                        {
+                            key: '2_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-user-minus',
+                        },
+                        {
+                            key: '2_2',
+                            label: 'Search',
+                            icon: 'pi pi-fw pi-users',
+                            items: [{
+                                    key: '2_2_0',
+                                    label: 'Filter',
+                                    icon: 'pi pi-fw pi-filter',
+                                    items: [{
+                                        key: '2_2_0_0',
+                                        label: 'Print',
+                                        icon: 'pi pi-fw pi-print'
+                                    }]
+                                },
+                                {
+                                    key: '2_2_1',
+                                    icon: 'pi pi-fw pi-bars',
+                                    label: 'List'
+                                }
+                            ]
+                        }
+                    ]
+                },
+                {
+                    key: '3',
+                    label: 'Events',
+                    icon: 'pi pi-fw pi-calendar',
+                    items: [{
+                            key: '3_0',
+                            label: 'Edit',
+                            icon: 'pi pi-fw pi-pencil',
+                            items: [{
+                                    key: '3_0_0',
+                                    label: 'Save',
+                                    icon: 'pi pi-fw pi-calendar-plus'
+                                },
+                                {
+                                    key: '3_0_0',
+                                    label: 'Delete',
+                                    icon: 'pi pi-fw pi-calendar-minus'
+                                }
+                            ]
+                        },
+                        {
+                            key: '3_1',
+                            label: 'Archieve',
+                            icon: 'pi pi-fw pi-calendar-times',
+                            items: [{
+                                key: '3_1_0',
+                                label: 'Remove',
+                                icon: 'pi pi-fw pi-calendar-minus'
+                            }]
+                        }
+                    ]
+                }
+            ],
+            expandedKeys: {}
+        }
+    },
+    methods: {
+        expandAll() {
+            for (let node of this.items) {
+                this.expandNode(node);
+            }
+
+            this.expandedKeys = {
+                ...this.expandedKeys
+            };
+        },
+        collapseAll() {
+            this.expandedKeys = {};
+        },
+        expandNode(node) {
+            if (node.items && node.items.length) {
+                this.expandedKeys[node.key] = true;
+
+                for (let child of node.items) {
+                    this.expandNode(child);
+                }
+            }
+        }
+    }
+}
+
+</code></pre>
+</div>
+
+        <p class="p-mt-3">In order to display some nodes as expanded by default, simply add their keys to the map.</p>
+<pre v-code.script><code>
+export default {
+    data() {
+        return {
+            items: //menu model instance,
+            expandedKeys: {}
+        }
+    },
+    mounted() {
+        this.expandedKeys[this.items[0.key]] = true;
+    }
+}
+
 </code></pre>
 
         <h5>Properties</h5>
         <p>Any property as style and class are passed to the main container element. Following are the additional properties to configure the component.</p>
-		<div class="doc-tablewrapper">
+            <div class="doc-tablewrapper">
 			<table class="doc-table">
 				<thead>
                     <tr>
@@ -172,6 +370,12 @@ export default {
                         <td>array</td>
                         <td>null</td>
                         <td>An array of menuitems.</td>
+                    </tr>
+                    <tr>
+                        <td>expandedKeys</td>
+                        <td>array</td>
+                        <td>null</td>
+                        <td>A map of keys to represent the expansion state in controlled mode.</td>
                     </tr>
 				</tbody>
 			</table>
@@ -257,7 +461,15 @@ export default {
                     content: `
 <template>
     <div>
-        <PanelMenu :model="items" />
+        <h5>Default</h5>
+         <PanelMenu :model="items" />
+
+         <h5>Programmatic</h5>
+         <div class="p-mb-3">
+               <Button type="button" icon="pi pi-plus" label="Expand All" @click="expandAll" class="p-mr-2" />
+               <Button type="button" icon="pi pi-minus" label="Collapse All" @click="collapseAll" />
+            </div>
+         <PanelMenu :model="items" :expandedKeys="expandedKeys" />
     </div>
 </template>
 
@@ -265,123 +477,159 @@ export default {
 export default {
     data() {
         return {
-            items: [
-                {
-                   label: 'File',
-                   icon:'pi pi-fw pi-file',
-                   items: [
-                      {
-                         label: 'New',
-                         icon:'pi pi-fw pi-plus',
-                         items: [
-                            {
-                               label: 'Bookmark',
-                               icon:'pi pi-fw pi-bookmark'
-                            },
-                            {
-                               label: 'Video',
-                               icon:'pi pi-fw pi-video'
-                            }
-                         ]
-                      },
-                      {
-                         label: 'Delete',
-                         icon:'pi pi-fw pi-trash'
-                      },
-                      {
-                         label: 'Export',
-                         icon:'pi pi-fw pi-external-link'
-                      }
-                   ]
+            expandedKeys: {},
+            items: [{
+                    key: '0',
+                    label: 'File',
+                    icon: 'pi pi-fw pi-file',
+                    items: [{
+                            key: '0_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-plus',
+                            items: [{
+                                    key: '0_0_0',
+                                    label: 'Bookmark',
+                                    icon: 'pi pi-fw pi-bookmark'
+                                },
+                                {
+                                    key: '0_0_1',
+                                    label: 'Video',
+                                    icon: 'pi pi-fw pi-video'
+                                }
+                            ]
+                        },
+                        {
+                            key: '0_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-trash'
+                        },
+                        {
+                            key: '0_2',
+                            label: 'Export',
+                            icon: 'pi pi-fw pi-external-link'
+                        }
+                    ]
                 },
                 {
-                   label: 'Edit',
-                   icon:'pi pi-fw pi-pencil',
-                   items: [
-                      {
-                         label: 'Left',
-                         icon:'pi pi-fw pi-align-left'
-                      },
-                      {
-                         label: 'Right',
-                         icon:'pi pi-fw pi-align-right'
-                      },
-                      {
-                         label: 'Center',
-                         icon:'pi pi-fw pi-align-center'
-                      },
-                      {
-                         label: 'Justify',
-                         icon:'pi pi-fw pi-align-justify'
-                      }
-                   ]
+                    key: '1',
+                    label: 'Edit',
+                    icon: 'pi pi-fw pi-pencil',
+                    items: [{
+                            key: '1_0',
+                            label: 'Left',
+                            icon: 'pi pi-fw pi-align-left'
+                        },
+                        {
+                            key: '1_1',
+                            label: 'Right',
+                            icon: 'pi pi-fw pi-align-right'
+                        },
+                        {
+                            key: '1_2',
+                            label: 'Center',
+                            icon: 'pi pi-fw pi-align-center'
+                        },
+                        {
+                            key: '1_3',
+                            label: 'Justify',
+                            icon: 'pi pi-fw pi-align-justify'
+                        }
+                    ]
                 },
                 {
-                   label: 'Users',
-                   icon:'pi pi-fw pi-user',
-                   items: [
-                      {
-                         label: 'New',
-                         icon:'pi pi-fw pi-user-plus',
+                    key: '2',
+                    label: 'Users',
+                    icon: 'pi pi-fw pi-user',
+                    items: [{
+                            key: '2_0',
+                            label: 'New',
+                            icon: 'pi pi-fw pi-user-plus',
 
-                      },
-                      {
-                         label: 'Delete',
-                         icon:'pi pi-fw pi-user-minus',
-                      },
-                      {
-                         label: 'Search',
-                         icon:'pi pi-fw pi-users',
-                         items: [
-                            {
-                               label: 'Filter',
-                               icon:'pi pi-fw pi-filter',
-                               items: [
-                                  {
-                                     label: 'Print',
-                                     icon:'pi pi-fw pi-print'
-                                  }
-                               ]
-                            },
-                            {
-                               icon:'pi pi-fw pi-bars',
-                               label: 'List'
-                            }
-                         ]
-                      }
-                   ]
+                        },
+                        {
+                            key: '2_1',
+                            label: 'Delete',
+                            icon: 'pi pi-fw pi-user-minus',
+                        },
+                        {
+                            key: '2_2',
+                            label: 'Search',
+                            icon: 'pi pi-fw pi-users',
+                            items: [{
+                                    key: '2_2_0',
+                                    label: 'Filter',
+                                    icon: 'pi pi-fw pi-filter',
+                                    items: [{
+                                        key: '2_2_0_0',
+                                        label: 'Print',
+                                        icon: 'pi pi-fw pi-print'
+                                    }]
+                                },
+                                {
+                                    key: '2_2_1',
+                                    icon: 'pi pi-fw pi-bars',
+                                    label: 'List'
+                                }
+                            ]
+                        }
+                    ]
                 },
                 {
-                   label: 'Events',
-                   icon:'pi pi-fw pi-calendar',
-                   items: [
-                      {
-                         label: 'Edit',
-                         icon:'pi pi-fw pi-pencil',
-                         items: [
-                            {
-                               label: 'Save',
-                               icon:'pi pi-fw pi-calendar-plus'
-                            },
-                            {
-                               label: 'Delete',
-                               icon:'pi pi-fw pi-calendar-minus'
-                            }
-                         ]
-                      },
-                      {
-                         label: 'Archieve',
-                         icon:'pi pi-fw pi-calendar-times',
-                         items: [
-                            {
-                               label: 'Remove',
-                               icon:'pi pi-fw pi-calendar-minus'
-                            }
-                         ]
-                      }
-                   ]
+                    key: '3',
+                    label: 'Events',
+                    icon: 'pi pi-fw pi-calendar',
+                    items: [{
+                            key: '3_0',
+                            label: 'Edit',
+                            icon: 'pi pi-fw pi-pencil',
+                            items: [{
+                                    key: '3_0_0',
+                                    label: 'Save',
+                                    icon: 'pi pi-fw pi-calendar-plus'
+                                },
+                                {
+                                    key: '3_0_0',
+                                    label: 'Delete',
+                                    icon: 'pi pi-fw pi-calendar-minus'
+                                }
+                            ]
+                        },
+                        {
+                            key: '3_1',
+                            label: 'Archieve',
+                            icon: 'pi pi-fw pi-calendar-times',
+                            items: [{
+                                key: '3_1_0',
+                                label: 'Remove',
+                                icon: 'pi pi-fw pi-calendar-minus'
+                            }]
+                        }
+                    ]
                 }
-             ]
+            ]
+        }
+    },
+    methods: {
+        expandAll() {
+            for (let node of this.items) {
+                this.expandNode(node);
+            }
+
+            this.expandedKeys = {
+                ...this.expandedKeys
+            };
+        },
+        collapseAll() {
+            this.expandedKeys = {};
+        },
+        expandNode(node) {
+            if (node.items && node.items.length) {
+                this.expandedKeys[node.key] = true;
+
+                for (let child of node.items) {
+                    this.expandNode(child);
+                }
+            }
         }
     }
 }
@@ -399,7 +647,15 @@ export default {
                     content: `
 <template>
     <div>
-        <PanelMenu :model="items" />
+        <h5>Default</h5>
+         <PanelMenu :model="items" />
+
+         <h5>Programmatic</h5>
+         <div class="p-mb-3">
+               <Button type="button" icon="pi pi-plus" label="Expand All" @click="expandAll" class="p-mr-2" />
+               <Button type="button" icon="pi pi-minus" label="Collapse All" @click="collapseAll" />
+            </div>
+         <PanelMenu :model="items" :expandedKeys="expandedKeys" />
     </div>
 </template>
 
@@ -408,124 +664,158 @@ import { ref } from 'vue';
 
 export default {
     setup() {
-        const items = ref([
-            {
-               label: 'File',
-               icon:'pi pi-fw pi-file',
-               items: [
-                  {
-                     label: 'New',
-                     icon:'pi pi-fw pi-plus',
-                     items: [
-                        {
-                           label: 'Bookmark',
-                           icon:'pi pi-fw pi-bookmark'
-                        },
-                        {
-                           label: 'Video',
-                           icon:'pi pi-fw pi-video'
-                        }
-                     ]
-                  },
-                  {
-                     label: 'Delete',
-                     icon:'pi pi-fw pi-trash'
-                  },
-                  {
-                     label: 'Export',
-                     icon:'pi pi-fw pi-external-link'
-                  }
-               ]
-            },
-            {
-               label: 'Edit',
-               icon:'pi pi-fw pi-pencil',
-               items: [
-                  {
-                     label: 'Left',
-                     icon:'pi pi-fw pi-align-left'
-                  },
-                  {
-                     label: 'Right',
-                     icon:'pi pi-fw pi-align-right'
-                  },
-                  {
-                     label: 'Center',
-                     icon:'pi pi-fw pi-align-center'
-                  },
-                  {
-                     label: 'Justify',
-                     icon:'pi pi-fw pi-align-justify'
-                  }
-               ]
-            },
-            {
-               label: 'Users',
-               icon:'pi pi-fw pi-user',
-               items: [
-                  {
-                     label: 'New',
-                     icon:'pi pi-fw pi-user-plus',
-                  },
-                  {
-                     label: 'Delete',
-                     icon:'pi pi-fw pi-user-minus',
-                  },
-                  {
-                     label: 'Search',
-                     icon:'pi pi-fw pi-users',
-                     items: [
-                        {
-                           label: 'Filter',
-                           icon:'pi pi-fw pi-filter',
-                           items: [
+        const expandedKeys = ref({});
+        const items = ref([{
+                  key: '0',
+                  label: 'File',
+                  icon: 'pi pi-fw pi-file',
+                  items: [{
+                           key: '0_0',
+                           label: 'New',
+                           icon: 'pi pi-fw pi-plus',
+                           items: [{
+                                 key: '0_0_0',
+                                 label: 'Bookmark',
+                                 icon: 'pi pi-fw pi-bookmark'
+                              },
                               {
-                                 label: 'Print',
-                                 icon:'pi pi-fw pi-print'
+                                 key: '0_0_1',
+                                 label: 'Video',
+                                 icon: 'pi pi-fw pi-video'
                               }
                            ]
-                        },
-                        {
-                           icon:'pi pi-fw pi-bars',
-                           label: 'List'
-                        }
-                     ]
-                  }
-               ]
-            },
-            {
-               label: 'Events',
-               icon:'pi pi-fw pi-calendar',
-               items: [
-                  {
-                     label: 'Edit',
-                     icon:'pi pi-fw pi-pencil',
-                     items: [
-                        {
-                           label: 'Save',
-                           icon:'pi pi-fw pi-calendar-plus'
-                        },
-                        {
+                     },
+                     {
+                           key: '0_1',
                            label: 'Delete',
-                           icon:'pi pi-fw pi-calendar-minus'
-                        }
-                     ]
-                  },
-                  {
-                     label: 'Archieve',
-                     icon:'pi pi-fw pi-calendar-times',
-                     items: [
-                        {
-                           label: 'Remove',
-                           icon:'pi pi-fw pi-calendar-minus'
-                        }
-                     ]
-                  }
-               ]
-            }
-        ]);
+                           icon: 'pi pi-fw pi-trash'
+                     },
+                     {
+                           key: '0_2',
+                           label: 'Export',
+                           icon: 'pi pi-fw pi-external-link'
+                     }
+                  ]
+               },
+               {
+                  key: '1',
+                  label: 'Edit',
+                  icon: 'pi pi-fw pi-pencil',
+                  items: [{
+                           key: '1_0',
+                           label: 'Left',
+                           icon: 'pi pi-fw pi-align-left'
+                     },
+                     {
+                           key: '1_1',
+                           label: 'Right',
+                           icon: 'pi pi-fw pi-align-right'
+                     },
+                     {
+                           key: '1_2',
+                           label: 'Center',
+                           icon: 'pi pi-fw pi-align-center'
+                     },
+                     {
+                           key: '1_3',
+                           label: 'Justify',
+                           icon: 'pi pi-fw pi-align-justify'
+                     }
+                  ]
+               },
+               {
+                  key: '2',
+                  label: 'Users',
+                  icon: 'pi pi-fw pi-user',
+                  items: [{
+                           key: '2_0',
+                           label: 'New',
+                           icon: 'pi pi-fw pi-user-plus',
 
-        return { items }
+                     },
+                     {
+                           key: '2_1',
+                           label: 'Delete',
+                           icon: 'pi pi-fw pi-user-minus',
+                     },
+                     {
+                           key: '2_2',
+                           label: 'Search',
+                           icon: 'pi pi-fw pi-users',
+                           items: [{
+                                 key: '2_2_0',
+                                 label: 'Filter',
+                                 icon: 'pi pi-fw pi-filter',
+                                 items: [{
+                                       key: '2_2_0_0',
+                                       label: 'Print',
+                                       icon: 'pi pi-fw pi-print'
+                                 }]
+                              },
+                              {
+                                 key: '2_2_1',
+                                 icon: 'pi pi-fw pi-bars',
+                                 label: 'List'
+                              }
+                           ]
+                     }
+                  ]
+               },
+               {
+                  key: '3',
+                  label: 'Events',
+                  icon: 'pi pi-fw pi-calendar',
+                  items: [{
+                           key: '3_0',
+                           label: 'Edit',
+                           icon: 'pi pi-fw pi-pencil',
+                           items: [{
+                                 key: '3_0_0',
+                                 label: 'Save',
+                                 icon: 'pi pi-fw pi-calendar-plus'
+                              },
+                              {
+                                 key: '3_0_0',
+                                 label: 'Delete',
+                                 icon: 'pi pi-fw pi-calendar-minus'
+                              }
+                           ]
+                     },
+                     {
+                           key: '3_1',
+                           label: 'Archieve',
+                           icon: 'pi pi-fw pi-calendar-times',
+                           items: [{
+                              key: '3_1_0',
+                              label: 'Remove',
+                              icon: 'pi pi-fw pi-calendar-minus'
+                           }]
+                     }
+                  ]
+               }
+         ]);
+
+         const expandAll = () => {
+            for (let node of nodes.value) {
+                expandNode(node);
+            }
+
+            expandedKeys.value = {...expandedKeys.value};
+        };
+        const collapseAll = () => {
+            expandedKeys.value = {};
+        };
+        const expandNode = (node) => {
+            if (node.children && node.children.length) {
+                expandedKeys.value[node.key] = true;
+
+                for (let child of node.children) {
+                    expandNode(child);
+                }
+            }
+        };
+
+        return { items, expandedKeys, expandAll, collapseAll, expandNode }
     }
 }
 <\\/script>
diff --git a/src/views/tree/TreeDoc.vue b/src/views/tree/TreeDoc.vue
index 3a9b6834b..4b34606e6 100755
--- a/src/views/tree/TreeDoc.vue
+++ b/src/views/tree/TreeDoc.vue
@@ -593,7 +593,7 @@ export default {
                         <td>expandedKeys</td>
                         <td>array</td>
                         <td>null</td>
-                        <td>A map of keys to represent the state of the tree expansion state in controlled mode.</td>
+                        <td>A map of keys to represent the expansion state in controlled mode.</td>
                     </tr>
                     <tr>
                         <td>selectionMode</td>