Use the addEventListener() method
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<?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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