code: public static DataGridTagModel getDataGridTagModel(JspContext jspContext) {
          Object model = jspContext.getAttribute(KEY_GRID_MODEL);
          assert model != null ? model instanceof DataGridTagModel : true;
          return (DataGridTagModel)model;
      }
docs: Get the {@link DataGridTagModel} instance from the {@link JspContext} using the
  {@link #KEY_GRID_MODEL} as the key.
  @param jspContext the jsp context
  @return the {@link DataGridTagModel} if one is found