Fixed #4929 - Add parent param to all pt method options

components/lib/accordion/Accordion.d.ts

@@ -31,6 +31,10 @@ export interface AccordionPassThroughMethodOptions {
      * Defines current inline state.
      */
     state: AccordionState;
+    /**
+     * Defines parent options.
+     */
+    parent: any;
     /**
      * Defines passthrough(pt) options in global config.
      */

components/lib/accordion/Accordion.vue

@@ -106,6 +106,7 @@ export default {
             const tabMetaData = {
                 props: tab.props || {},
                 parent: {
+                    instance: this,
                     props: this.$props,
                     state: this.$data
                 },