/**
 * @throws Nette\Application\AbortException
 */
public function updateTree($data)
{
    $this->sendResponse(new Nette\Application\Responses\JsonResponse($data));
}


public function actionDefault()
{
    $this->updateTree(array(
        array('title'=> 'Hello1'),
        array('title'=> 'Hello2')
    ));
}