static public function getRootElementClass($component)
    {
        if (!is_string($component)) $component = $component->getData()->componentClass;
        $ret = '';
        if (self::hasSetting($component, 'rootElementClass')) {
            $ret .= self::getSetting($component, 'rootElementClass').' ';
        }
        $ret .= Kwf_Component_Abstract::formatRootElementClass($component, '');
        return $ret;
    }