@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)