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  4. Use Validator to validate data from a form


  
    
      import mx.events.ValidationResultEvent;
      private function invalidHandler(event:ValidationResultEvent):void {
        usernameItem.setStyle("color", 0xFF0000);
      }
      private function validHandler(event:ValidationResultEvent):void {
        usernameItem.setStyle("color", 0x000000);
     }