@Override
  public TreeTableCellRenderer createTableRenderer(TreeTableModel treeTableModel) {
    TreeTableCellRenderer tableRenderer = super.createTableRenderer(treeTableModel);
    tableRenderer.setRootVisible(false);
    tableRenderer.setShowsRootHandles(true);
    return tableRenderer;
  }
@Override
  public TreeTableCellRenderer createTableRenderer(TreeTableModel treeTableModel)