if ( !is_null($dom->getElementById('dropmenu'))){
	$navElement = $dom->getElementById('dropmenu')->lastChild;

	// 挿入するNodeを生成
	$template = $dom->createDocumentFragment();
	$template->appendXML($twig);
	$node = $dom->importNode($template, true);

	// 基準となるElementの直後にNodeを挿入し、Responsを書き換え
	$navElement->appendChild($node);
	$crawler = new Crawler($dom);
	$response->setContent($crawler->html());
	$event->setResponse($response);
}