anchor.diff:        _context.game.world.addChild(tile);
       });
       if (isMovable) {
  -      _context.game.stage.juggler.add(this);
  +      _context.game.world.juggler.add(this);
       }
     }
   
  
positive.code:    * Is the background movable.
     */
    bool isMovable;
     
    
    /**
     * Create tile based background from [StageXL.BitmapData].
     */
    Background.bitmapdata(State stateContext, StageXL.BitmapData bitmapData, 
        {bool isMovable: false, bool addToWorld: true, 
          String repeatMode: DEFAULT_REPEAT_MODE, 
          String scaleMode: DEFAULT_SCALE_MODE}) {
      
      _context = stateContext;
  
      StageXL.BitmapData backgroundTileBitmapdata = bitmapData;
  
negative.code:  * Basically the background is just a bunch of tiles.
   */
  class Background implements StageXL.Animatable {
  
    State _context;
  
    List<StageXL.Bitmap> _backgroundTileList = new List<StageXL.Bitmap>();
  
  
    static const String REPEAT_NONE = "repeatNone";
    static const String REPEAT_X = "repeatX";
    static const String REPEAT_Y = "repeatY";
  