menuBar.setOpaque(true);
  protected void installDefaults()  {    UIDefaults defaults = UIManager.getLookAndFeelDefaults();    menuBar.setBackground(defaults.getColor("MenuBar.background"));    menuBar.setBorder(defaults.getBorder("MenuBar.border"));    menuBar.setFont(defaults.getFont("MenuBar.font"));    menuBar.setForeground(defaults.getColor("MenuBar.foreground"));  }