xmlns:s="library://ns.adobe.com/flex/spark"
initialize="createListener(event);">
import mx.controls.Alert;
private function createListener(e:Event):void {
b1.addEventListener(MouseEvent.CLICK, myClickHandler);
}
private function myClickHandler(e:Event):void {
Alert.show("The event dispatched by the MOUSE_OVER was of type '" + e.type + "'.");
}