@Override
  public void toggleSortOrder(int column) {
    final SortOrder sortOrder = mySortKey != null && mySortKey.getColumn() == column && mySortKey.getSortOrder() == SortOrder.ASCENDING
                                ? SortOrder.DESCENDING : SortOrder.ASCENDING;
    setSortKeys(Collections.singletonList(new SortKey(column, sortOrder)));
  }
@Override
  public void toggleSortOrder(int column)