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ComboBox Selected Index

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">      <mx:Script>            import mx.controls.Alert;       private function changeHandler(event:Event):void       {         if (categoryList.selectedIndex == 0)         {           Alert.show("You selected all categories", "Everything!");         }         else         {           Alert.show("You selected " + categoryList.selectedItem, "One Thing!");         }       }       </mx:Script>      <mx:ComboBox id="categoryList" change="changeHandler(event)">     <mx:dataProvider>       <mx:String>All Categories</mx:String>       <mx:String>A</mx:String>       <mx:String>B</mx:String>       <mx:String>C</mx:String>       <mx:String>D</mx:String>     </mx:dataProvider>   </mx:ComboBox>    </mx:Application>