public static function nav($type, $items, $htmlOptions = array())
    {
        self::addCssClass('nav', $htmlOptions);
        if (!empty($type)) {
            self::addCssClass('nav-' . $type, $htmlOptions);
        }
        $stacked = TbArray::popValue('stacked', $htmlOptions, false);
        if ($type !== self::NAV_TYPE_LIST && $stacked) {
            self::addCssClass('nav-stacked', $htmlOptions);
        }
        return self::menu($items, $htmlOptions);
    }