/**
   * Mark a cell as containing the magical "otherwise" value. The magical "otherwise" value has the
   * meaning of all values other than those explicitly defined for this column.
   */
  public void makeOtherwiseCell() {

    MergableGridWidget<DTColumnConfig> grid = widget.getGridWidget();
    List<CellValue<?>> selections = grid.getSelectedCells();
    CellValue<?> cell = selections.get(0);

    if (canAcceptOtherwiseValues(cell)) {

      // Set "otherwise" property on cell
      for (CellValue<?> cv : selections) {
        cv.addState(CellState.OTHERWISE);
      }
      grid.update(null);
    }
  }