public function indexAction()
    {
        $view = new ViewModel();
        $service = $this->getThemeService();
        $view->registeredThemes = $service->getRegisteredThemes();
        $view->options = $this->getModuleOptions();
        $flashMessenger = $this->flashMessenger();
        if ($flashMessenger->hasMessages()) {
            $view->messages = $flashMessenger->getMessages();
        }
        return $view;
    }