中略
■ActionScript 3.0クラス定義を行った場合

// ActionScript 3.0クラス定義: MyButton.as
package {
	import flash.display.MovieClip;
	import flash.events.MouseEvent;
	public class MyButton extends MovieClip {
		var onRelease:Function = function (){};
		function MyButton() {
			addEventListener(MouseEvent.CLICK, click);
		}
		function click(eventObject:MouseEvent):void {
			onRelease(eventObject);
		}
	}
}

中略