installDefaults();
  public void installUI(JComponent c)  {    super.installUI(c);    if (c instanceof JScrollBar)      {	scrollbar = (JScrollBar) c;	trackRect = new Rectangle();	thumbRect = new Rectangle();	scrollTimer = new Timer(300, null);	installComponents();	installDefaults();	configureScrollBarColors();	installListeners();	calculatePreferredSize();      }  }