@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"));
  }
  @Override
  public void paint(Graphics g, JComponent c) {

    String style = (String) c.getClientProperty("Quaqua.Button.style");
    if (style != null && style.equals("help")) {
      Insets insets = c.getInsets();
      UIManager.getIcon("Button.helpIcon").paintIcon(c, g, insets.left, insets.top);
      return;
    }

    Object oldHints = QuaquaUtilities.beginGraphics((Graphics2D) g);
    if (((AbstractButton) c).isBorderPainted()) {
      Border b = c.getBorder();
      if (b != null && b instanceof BackgroundBorder) {
        ((BackgroundBorder) b)
            .getBackgroundBorder()
            .paintBorder(c, g, 0, 0, c.getWidth(), c.getHeight());
      }
    }
    super.paint(g, c);
    QuaquaUtilities.endGraphics((Graphics2D) g, oldHints);
    Debug.paint(g, c, this);
  }