public function render($group = null)
    {
        $this->config('content.url', Router::url($this->config('content.url')));
        $content = $this->formatTemplate('content', $this->config('content'));

        if ($group) {
            $this->config(array_shift($this->_config['childConfig']));
            $menu = new MenuGroup([$this->config()], $this->_here);
            $content .= $menu->render($group);
            $this->_active = $this->_active || $menu->active();
        }

        return $content;
    }