[Vektor]

Так, мне кажется лучше.

package {
	import flash.display.MovieClip;
	import flash.events.MouseEvent;
	public class Cbutton extends MovieClip {
		private var _mcButton:mcButton=new mcButton  ;
                       //Здесь из библиотеки можно вытащить другой клип.
		private var _mcButton1:mcButton1=new mcButton1  ;
		public function Cbutton():void {
			// constructor code
			fButtonCreate(_mcButton,100,100);
			fButtonCreate(_mcButton1,200,100);
 
		}
                   private function fButtonCreate(But:MovieClip,x:int,y:int):void {
			addChild(But);
			But.stop();
			But.x=x;
			But.y=y;
			this.addEventListener(MouseEvent.MOUSE_OVER, fMouseEvent);
			this.addEventListener(MouseEvent.MOUSE_OUT, fMouseEvent);
			this.addEventListener(MouseEvent.MOUSE_DOWN, fMouseEvent);
			this.addEventListener(MouseEvent.MOUSE_UP, fMouseEvent);
		}
		private function fMouseEvent(event:MouseEvent):void {
			switch (event.type) {
				case MouseEvent.MOUSE_OVER :
					event.target.gotoAndStop(2);
					break;
				case MouseEvent.MOUSE_OUT :
					event.target.gotoAndStop(1);
					break;
				case MouseEvent.MOUSE_DOWN :
					event.target.gotoAndStop(3);
					break;
				case MouseEvent.MOUSE_UP :
					event.target.gotoAndStop(2);
					break;
			}
		}
	}
}