anchor.diff:    dartlib.EventRoot get targetChanged => _targetChanged;
   
     int get visualChildCount {
  -    var count = 1;
  +    var count = 2;
       if(_elements != null) {
         count +=_elements.length;
       }
  
positive.code:           throw 'not supported';
        }
  
        _animationLayer.add(new TextAniRequest(texturePrefix, frameCount, squareOffset, delay));
      }
    }
  
    void _squareClicked(ElementMouseEventArgs args) {
  
negative.code:       }
  
        // update the animation layer
        _popLayerTx.setToTranslation(offset.x, offset.y);
        _dartLayerTx.setToTranslation(offset.x, offset.y);
      }
    }
  
  