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Set popup menu selected item

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" height="600"     width="600" creationComplete="initData();">     <mx:Script>                  import mx.events.*;         import mx.controls.*;         private function initData():void {             Menu(p1.popUp).selectedIndex=2;         }         public function itemClickHandler(event:MenuEvent):void {             Alert.show("itemClick event label: " + event.label  + " \nindex: " + event.index                     + " \nitem.label: " + event.item.label                     + " \nitem.data: " + event.item.data);         }         public function clickHandler(event:MouseEvent):void {             Alert.show(" Click Event currentTarget.label: " + event.currentTarget.label);         }         [Bindable]         public var menuDP:Array = [             {label: "A", data: "a"},             {label: "B", data: "b"},             {label: "C", data: "c"},             {label: "D", data: "d"},             {label: "E", data: "e"}         ];       </mx:Script>     <mx:PopUpMenuButton id="p1" showRoot="true" dataProvider="{menuDP}" click="clickHandler(event)" itemClick="itemClickHandler(event);" /> </mx:Application>