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Add data to ComboBox when click the button

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     initialize="initData()">     <mx:Script>                      import mx.collections.*;             [Bindable]             public var stateArray:ArrayCollection;             public function initData():void {                 stateArray=new ArrayCollection(                 [{label:"AL", data:"aa"},                  {label:"AK", data:"BB"},                  {label:"AR", data:"CC"}]);             }                </mx:Script>     <mx:ComboBox id="myComboBox" dataProvider="{stateArray}" />     <mx:Button label="Add AZ" click="myComboBox.dataProvider.addItem({'label':'Z','data':'ZZ'});" /> </mx:Application>