@Override
  protected void installDefaults(AbstractButton b) {
    super.installDefaults(b);

    String pp = getPropertyPrefix();
    // b.setOpaque(QuaquaManager.getBoolean(pp+"opaque"));
    QuaquaUtilities.installProperty(b, "opaque", UIManager.get(pp + "opaque"));
    b.setRequestFocusEnabled(UIManager.getBoolean(pp + "requestFocusEnabled"));
    b.setFocusable(UIManager.getBoolean(pp + "focusable"));
  }
 /** {@inheritDoc} */
 @Override
 protected void installListeners(JScrollPane c) {
   super.installListeners(c);
   c.addPropertyChangeListener(this);
   if (UIManager.getBoolean("ScrollPane.useChildTextComponentFocus")) {
     viewportViewFocusHandler = new ViewportViewFocusHandler();
     c.getViewport().addContainerListener(viewportViewFocusHandler);
     Component view = c.getViewport().getView();
     if (view instanceof JTextComponent) {
       view.addFocusListener(viewportViewFocusHandler);
     }
   }
 }