code: public void doTag()
              throws JspException {
  
          DataGridTagModel dgm = DataGridUtil.getDataGridTagModel(getJspContext());
          if(dgm == null)
              throw new JspException(Bundle.getErrorString("DataGridTags_MissingDataGridModel"));
  
          String output = dgm.getPagerRenderer().render();
          if(output != null)
              write(output);
      }
docs: <p>
  Tag rendering method that renders the data grid's registered
  {@link org.apache.beehive.netui.databinding.datagrid.api.rendering.PagerRenderer} into the
  page's output.
  </p>
  @throws JspException when an error occurs rendering or no {@link DataGridTagModel} can be found.