
      tr.startTH().colSpan(2).rowSpan(2)
          .className(style.header() + " " + style.firstColumnHeader());
      tr.endTH();

      /*
       * Name group header. Associated with the last name column, so clicking on
       * the group header sorts by last name.
       */
      TableCellBuilder th = tr.startTH().colSpan(2).className(groupHeaderCell);
      enableColumnHandlers(th, lastNameColumn);
      th.style().trustedProperty("border-right", "10px solid white").cursor(Cursor.POINTER)
          .en