 		// these bitmaps will be added as a children
  		protected const backgroundBitmap:Bitmap = new Bitmap(null, PixelSnapping.AUTO, true);
 		protected const plotBitmap:Bitmap = new Bitmap(null, PixelSnapping.AUTO, true);
-		protected const aggregateBitmap:Bitmap = new Bitmap(null, PixelSnapping.AUTO, true);
 
 		// access the filters of the background layer only
 		public function get backgroundFilters():Array 			 { return backgroundBitmap.filters;  }

package weave.visualization.layers
{
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.PixelSnapping;
	import flash.geom.Point;
	
	import mx.core.UIComponent;
	import mx.utils.NameUtil;

			// clean up everything that does not get cleaned up automatically.
			disposeObjects(
				backgroundBitmap.bitmapData,
				plotBitmap.bitmapData
			);
			if (!usingExternalSpatialIndex)
				disposeObjects(spatialIndex);
