/**
   * Overridden to message super and forward the method to the tree. Since the tree is not actually
   * in the component hierarchy it will never receive this unless we forward it in this manner.
   */
  public void updateUI() {
    super.updateUI();

    if (tree != null) tree.updateUI();

    // Use the tree's default foreground and background colors in the
    // table.
    LookAndFeel.installColorsAndFont(this, "Tree.background", "Tree.foreground", "Tree.font");
  }