Define a handler function, register it for click event of the Button control

        

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    initialize="createListener()">
    <mx:Script>
    import mx.controls.Alert;
    
    private function createListener():void {
        b1.addEventListener(MouseEvent.CLICK, myClickHandler, false, 0);
    }
    private function myClickHandler(e:MouseEvent):void {
        Alert.show("The button was clicked");
    }
  </mx:Script>
    <mx:Button label="Click Me" id="b1" />
</mx:Application>

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Define a handler function, register it for click event of the Button control : Button Event « Components « Flex

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