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ButtonBar click changed event

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:s="library://ns.adobe.com/flex/spark">     <mx:Script>                      import mx.collections.ArrayCollection;             import spark.events.IndexChangeEvent;             import mx.controls.Alert;                          [Bindable]             protected var btnBarData:ArrayCollection = new ArrayCollection(                 [                     {label: 'Show Labels', mode: 'labels'},                     {label: 'Show Titles', mode: 'titles'}                 ]             );             protected function btnBar_changeHandler(event:IndexChangeEvent):void{                 var selectedItem:Object = btnBarData.getItemAt(event.newIndex) as Object;                 switch(selectedItem.mode){                     case "labels":                         Alert.show('A');                         break;                     case "titles":                         Alert.show('B');                         break;                     default:                         break;                 }             }            </mx:Script>          <s:ButtonBar id="btnBar"                  dataProvider="{btnBarData}"                  change="btnBar_changeHandler(event)"/>      </mx:Application>