Add event listener function to Button with ActionScript

        
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    creationComplete="initApp()">
    <mx:Script>
        import mx.controls.Alert;
        private function initApp():void {
            b1.addEventListener(MouseEvent.CLICK, myEventHandler);
        }
        private function myEventHandler(event:Event):void {
            Alert.show("An event occurred");
        }
      </mx:Script>
    <mx:Button id="b1" label="Click Me" />
</mx:Application>

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Add event listener function to Button with ActionScript : Button Event « Components « Flex

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