anchor.diff:    }
     div.querySelector(".preview-control .close").onClick.listen(onCloseButtonClick);
     div.querySelector(".preview-control .clone").onClick.listen(onCloneButtonClick);
  +
  +  sortableGroup.install(div);
   }
   
   void onDimensionLabelClick(Event e) {
  
positive.code: HtmlElement container;
  HtmlElement draggedElement;
  num previewCounter = 0;
  
  void main() {
    container = querySelector('#container');
  
negative.code:   } else {
      onRefreshClick(null);
    }
    sortableGroup.isGrid = true;
    sortableGroup.installAll(querySelectorAll('.preview'));
  }
  
  
  