public function renderItem($item)
    {
        $content = ArrayHelper::getValue($item, 'content', '');
        $caption = ArrayHelper::getValue($item, 'caption');

        if ($caption !== null) {
            $caption = \CHtml::tag('div', array('class' => Enum::ORBIT_CAPTION), $caption);
        }
        return \CHtml::tag('li', array(), $content . $caption);
    }