b.updateUI();
  protected void addImpl(Component component, Object constraints, int index)  {    // XXX: Sun says disable button but test cases show otherwise.    super.addImpl(component, constraints, index);    // if we added a Swing Button then adjust this a little    if (component instanceof AbstractButton)      {        AbstractButton b = (AbstractButton) component;        b.setRolloverEnabled(rollover);        b.updateUI();      }  } // addImpl()