More than one node is selectable by setting selectionMode to multiple. By default in multiple selection mode, metaKey press (e.g. ⌘) is not necessary to add to existing selections. When the optional metaKeySelection is present, behavior is changed in a way that selecting a new node requires meta key to be present. Note that in touch enabled devices, Tree always ignores metaKey.
In multiple selection mode, value binding should be a key-value pair where key is the node key and value is a boolean to indicate selection.