/**
* {@inheritdoc}
*/
public function render()
{
$title = $this->getTitle();
if (sizeof($this->ul->getElements()) == 0) {
$this->ul->setRenderable(false);
} else {
$this->setTitle($title . ' <span class="caret"></span>');
}
$return = $this->container->render();
$this->setTitle($title);
return $return;
}