code: public final TableSubHeader render(int columnCount) {
          TableSubHeader element = getWidget();
          if(element == null) {
              element = new TableSubHeader(this, columnCount);
              setWidget(element);
          }
  
          render(element, columnCount);
          return element;
      }
docs: Render the data category row element.
  
  @return a fully formed {@link TableSubHeader} object.