anchor.diff:            ..attributes["id"] = '${m.id}'
             ..attributes["title"] = m.toolTip != null ? m.toolTip : ""
             ..attributes['ismovable'] = '${m.isMovable}'
  -          ..column = m
  -          ..classes.add(m.headerCssClass != null ? m.headerCssClass : "");
  +          ..column = m;
  +        if (m.headerCssClass != null) 
  +          header.classes.add(m.headerCssClass);
           _headers.append(header);
   
           if (_gridOptions.enableColumnReorder || m.sortable) {
  
positive.code:       }
      }
  
      dom.HtmlElement cellElement = new dom.DivElement()..classes.add(cellCss);
  
      if (m.isDraggable) {
        cellElement.attributes['draggable'] = 'true';
  
negative.code: 
      dom.HtmlElement rowElement = new dom.DivElement()
        ..classes.add('ui-widget-content')
        ..classes.addAll(rowCss.split(" ").where((s) => s.length > 0))
        ..style.top = '${_getRowTop(row)}px';
        
      //stringArray.add(rowElement);
  
      String colspan;
  