sorry, I only half read your post (my fault, obviously)

Here is how you would do it in your Class file
Code:
package {
	import flash.display.*;
	import flash.events.*;

	public class buttonWork extends MovieClip {
		public function buttonWork()
		{
			theButton.addEventListener(MouseEvent.CLICK, clickEvent);
		}
		
		private function clickEvent(e:MouseEvent):void
		{
			gotoAndStop('success');
		}
	}
}