root in AS3 (TopLevel )

package {
 
	import flash.display.DisplayObject;
	import flash.display.MovieClip;
	import flash.display.Stage;
 
	/*
	 * TopLevel class
	 * have all document classes extend this
	 * class instead of Sprite or MovieClip to
	 * allow global stage and root access through
	 * TopLevel.stage and TopLevel.root
	 */
	public class TopLevel extends MovieClip {
 
		public static var stage:Stage;
		public static var root:DisplayObject;
 
		public function TopLevel() {
			TopLevel.stage = this.stage;
			TopLevel.root = this;
		}
	}
}