Glow effectStart event
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"> <mx:Script> private function onEvent( event : Event ) : void { trace( event.type + " event occurred" ); } </mx:Script> <mx:Button label="Play Effect" > <mx:mouseDownEffect> <mx:Glow color="#FF0000" effectStart="onEvent( event )"/> </mx:mouseDownEffect> </mx:Button> </mx:Application>