focusColor = UIManager.getColor(prefix + "focus");
  protected void installDefaults(AbstractButton b)  {    String prefix = getPropertyPrefix();    LookAndFeel.installColorsAndFont(b, prefix + "background",                                     prefix + "foreground", prefix + "font");    LookAndFeel.installBorder(b, prefix + "border");    focusColor = UIManager.getColor(prefix + "focus");    b.setMargin(UIManager.getInsets(prefix + "margin"));    b.setIconTextGap(UIManager.getInt(prefix + "textIconGap"));    b.setInputMap(JComponent.WHEN_FOCUSED,                   (InputMap) UIManager.get(prefix + "focusInputMap"));    b.setRolloverEnabled(UIManager.getBoolean(prefix + "rollover"));  }