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Open event and change event for ComboBox

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>         private function openEvt():void {             forChange.text="";         }         private function changeEvt(e:Event):void {             forChange.text=e.currentTarget.value + " " + e.currentTarget.selectedIndex;         }       </mx:Script>     <mx:ComboBox open="openEvt()" change="changeEvt(event)">         <mx:dataProvider>             <mx:Array>                 <mx:String>AK</mx:String>                 <mx:String>AL</mx:String>                 <mx:String>AR</mx:String>             </mx:Array>         </mx:dataProvider>     </mx:ComboBox>     <mx:TextArea id="forChange" width="150" /> </mx:Application>