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Change form input box label when data is not valid

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">   <mx:Script>            import mx.events.ValidationResultEvent;       private function invalidHandler(event:ValidationResultEvent):void {         usernameItem.label = "-=Name=-";       }       private function validHandler(event:ValidationResultEvent):void {         usernameItem.label = "Name";      }      </mx:Script>   <mx:Form>     <mx:FormItem id="usernameItem" label="Name">       <mx:TextInput id="username"/>     </mx:FormItem>     <mx:FormItem>         <mx:Button id="button" label="Submit" />     </mx:FormItem>   </mx:Form>   <mx:Validator id="validator" source="{username}" property="text" invalid="invalidHandler(event)" valid="validHandler(event)" listener="{null}" /> </mx:Application>