code: @Override
      public void renderHead(final Component _component,
                             final IHeaderResponse _response)
      {
          super.renderHead(_component, _response);
          if (this.toggleSplitter) {
              _response.render(RequireHeaderItem.forClasses(DojoClasses.ToggleSplitter));
              _response.render(CssHeaderItem.forReference(BorderContainerBehavior.CSS_SPLITTER));
          }
          _response.render(RequireHeaderItem.forClasses(DojoClasses.BorderContainer, DojoClasses.parser));
      }
docs: Render the links for the head.
  
  @param _component component the header will be rendered for
  @param _response resonse to add