ActionScript 3 с нуля

[milDude]

Optics.as - Document Class

package code {
		
	public class Optics extends Sprite{

		private var lookedObject;
		
		public function Optics(){
			
			lookedObject = new LookedObject(); addChild(lookedObject);
			
		}
		
	}
}

LookedObject.as

package code {

	class LookedObject extends Sprite {
		
		public var point1;
		
		public function LookedObject(){
			point1 = new Point(); addChild(point1);
		}
		public function drawLine():void{
			trace('code');
		}
		
	}
}

Point.as

package code {

	class Point extends Sprite {
		
		public function Point(){
			graphics.beginFill(0xcccccc, 1);
			graphics.drawCircle(0, 0, 5);
		}
		override public function set y(value:Number):void {
			super.y = value;
			parent.drawLine();
		}
	}
}

CompillerErrors

1061: Call to a possibly undefined method drawLine through a reference with static type flash.display:DisplayObjectContainer.

Подскажите пожалуйста где ошибка?