anchor.diff:          )
       );
   
  -    _gridContainer.addComponent(_headerContainer);
  +    _gridContainer.addComponent(_headerBounds);
       _gridContainer.addComponent(_list);
   
       addComponent(_gridContainer);
  
positive.code:     if (value != _headless) {
        _headless = value;
        
        if (_headerContainer != null) _headerContainer.visible = _headerContainer.includeInLayout = !value;
  
        if (_headerItemRenderers != null) {
  
negative.code:       
        if (_autoManageScrollBars) _list.horizontalScrollPolicy = (tw > _width) ? ScrollPolicy.AUTO : ScrollPolicy.NONE;
        else _list.horizontalScrollPolicy = _horizontalScrollPolicy;
        
        if (_headerBounds != null) {
          _headerBounds.width = w;
          _headerBounds.height = _headerHeight;
        }
  
        if (_headerContainer != null) {
          _headerContainer.width = w;
  