protected function displayDivider(SwatOption $option, $index)
    {
        $span_tag = new SwatHtmlTag('span');
        $span_tag->class = 'swat-radio-list-divider';
        if ($option->value !== null) {
            $span_tag->id = $this->id . '_' . (string) $option->value;
        }

        $span_tag->setContent($option->title, $option->content_type);
        $span_tag->display();
    }