@NotNull
    @Override
    public Dimension computeMyPreferredSize() {
      int count = getTableColumnModel().getColumnCount();
      return new Dimension(0,
                           (count == 0) ? 0 : (getColumns().get(0).getMyHeight() + filterRowHeightDelta));
    }
@NotNull
    @Override
    public Dimension computeMyPreferredSize()