Extjs adding a listener to tree panel returns Uncaught TypeError: Cannot read property 'scope' of undefined -


i trying add selection change listener on tree panel following error: uncaught typeerror: cannot read property 'scope' of undefined

code follows: xxx.view.trees.maintree.js

extend: 'ext.tree.panel',  requires: [      'xxx.store.treestore'  ], xtype: 'main-tree',   height: 400, width: 350, title: 'tree', usearrows: true,  initcomponent: function() {     ext.apply(this, {         store: new xxx.store.treestore(),         listeners:{              selectionchange:this.onclick         }     });     this.callparent(); }

xxx.store.treestore

extend: 'ext.data.treestore',   proxy: {     type: 'ajax',     url: 'resources/tree-nodes.json' },  root: {     text: 'contacts',     id: 'src',     expanded: true },

xxx.view.maincontroller.js

  onclick: function (sender, selected, eopts) {  }

replace:

selectionchange:this.onclick

with:

selectionchange: 'onclick'

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