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Setup PopupMenuButton

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">     <mx:Script>          import mx.controls.Menu     private function initMenuData():void {         Menu(popupMB.popUp).selectedIndex=2;     }        </mx:Script>     <mx:XML id="fileMenuChoices" format="e4x">         <root>             <fileItem label="New"/>             <fileItem label="Open"/>             <fileItem label="Save"/>             <separator type="separator"/>             <fileItem label="Exit"/>         </root>     </mx:XML>     <mx:PopUpMenuButton id="popupMB"                         showRoot="false"                         labelField="@label"                         dataProvider="{fileMenuChoices}"                         creationComplete="initMenuData();"/> </mx:Application>