 		 */
 		private function init():void
 		{
-			constantZeroPoint.x = 0;
-			constantZeroPoint.y = 0;
-			
 			// generate a name for debugging
 			name = NameUtil.createUniqueName(this);
 			// default size = 100%,100%
 			percentWidth = 100;
 			percentHeight = 100;
 			
-			//this.addChild(backgroundBitmap);
-			//this.addChild(plotBitmap);
-			this.addChild(aggregateBitmap);
+			this.addChild(backgroundBitmap);
+			this.addChild(plotBitmap);
 			
 			// make selectionFilter appear in session state.
 			registerLinkableChild(this, selectionFilter);

				_graphicsAreValid = true;
			}
		}
		
		private const constantZeroPoint:Point = new Point();
		private function trace(...args):void
		{
			DebugUtils.debug_trace(this, selectionFilter.globalName, args);

		protected function handleSizeChange():void
		{
			//trace("sizeChanged",unscaledWidth,unscaledHeight);
			var bitmapChanged:Boolean = PlotterUtils.setBitmapDataSize(plotBitmap, unscaledWidth, unscaledHeight);
			if (bitmapChanged)
				invalidateGraphics();
