/**
* Render a Fieldset
*
* @param Zend\Form\Fieldset $fieldset
* @return void
*/
public function renderFieldset(Fieldset $fieldset)
{
$id = $fieldset->getId() ?: $fieldset->getName();
return '<fieldset id="fieldset-' . $id . '">' . $this->render($fieldset) . '</fieldset>';
}