scrollBarShadowColor = UIManager.getColor("ScrollBar.shadow");
  protected void installDefaults()  {        // need to initialise isFreeStanding before calling the super class,     // so that the value is set when createIncreaseButton() and     // createDecreaseButton() are called (unless there is somewhere earlier    // that we can do this).    Boolean prop = (Boolean) scrollbar.getClientProperty(FREE_STANDING_PROP);    isFreeStanding = (prop == null ? true : prop.booleanValue());    super.installDefaults();  }