protected function getCSSClassNames()
    {
        $classes = array();
        $classes[] = 'swat-frame';
        $classes[] = 'swat-disclosure-control-opened';
        $classes[] = 'swat-frame-disclosure-control-opened';
        $classes[] = 'swat-frame-disclosure';
        $classes = array_merge($classes, parent::getCSSClassNames());
        return $classes;
    }