protected function addContentTagToOpenTags(&$tag)
    {
        if ($tag->getTagName() != 'option') {
            return;
        }
        foreach (array_keys($this->tags) as $name) {
            for ($i = 0, $count = count($this->tags[$name]); $i < $count; $i++) {
                $this->tags[$name][$i]->addTag($tag);
            }
        }
    }