RainLab\Pages\Classes\Page::getMenuTypeInfo PHP Method

    public static function getMenuTypeInfo($type)
    {
        if ($type == 'all-static-pages') {
            return ['dynamicItems' => true];
        }
        if ($type == 'static-page') {
            return ['references' => self::listStaticPageMenuOptions(), 'nesting' => true, 'dynamicItems' => true];
        }
    }

 public function boot()
 {
     Event::listen('cms.router.beforeRoute', function ($url) {
         return Controller::instance()->initCmsPage($url);
     });
     Event::listen('cms.page.beforeRenderPage', function ($controller, $page) {
         /*
          * Before twig renders
          */
         $twig = $controller->getTwig();
         $loader = $controller->getLoader();
         Controller::instance()->injectPageTwig($page, $loader, $twig);
         /*
          * Get rendered content
          */
         $contents = Controller::instance()->getPageContents($page);
         if (strlen($contents)) {
             return $contents;
         }
     });
     Event::listen('cms.page.initComponents', function ($controller, $page) {
         Controller::instance()->initPageComponents($controller, $page);
     });
     Event::listen('cms.block.render', function ($blockName, $blockContents) {
         $page = CmsController::getController()->getPage();
         if (!isset($page->apiBag['staticPage'])) {
             return;
         }
         $contents = Controller::instance()->getPlaceholderContents($page, $blockName, $blockContents);
         if (strlen($contents)) {
             return $contents;
         }
     });
     Event::listen('pages.menuitem.listTypes', function () {
         return ['static-page' => 'rainlab.pages::lang.menuitem.static_page', 'all-static-pages' => 'rainlab.pages::lang.menuitem.all_static_pages'];
     });
     Event::listen('pages.menuitem.getTypeInfo', function ($type) {
         if ($type == 'url') {
             return [];
         }
         if ($type == 'static-page' || $type == 'all-static-pages') {
             return StaticPage::getMenuTypeInfo($type);
         }
     });
     Event::listen('pages.menuitem.resolveItem', function ($type, $item, $url, $theme) {
         if ($type == 'static-page' || $type == 'all-static-pages') {
             return StaticPage::resolveMenuItem($item, $url, $theme);
         }
     });
     Event::listen('backend.form.extendFieldsBefore', function ($formWidget) {
         if ($formWidget->model instanceof \Cms\Classes\Partial) {
             Snippet::extendPartialForm($formWidget);
         }
     });
     Event::listen('cms.template.save', function ($controller, $template, $type) {
         Plugin::clearCache();
     });
     Event::listen('cms.template.processSettingsBeforeSave', function ($controller, $dataHolder) {
         $dataHolder->settings = Snippet::processTemplateSettingsArray($dataHolder->settings);
     });
     Event::listen('cms.template.processSettingsAfterLoad', function ($controller, $template) {
         Snippet::processTemplateSettings($template);
     });
     Event::listen('cms.template.processTwigContent', function ($template, $dataHolder) {
         if ($template instanceof \Cms\Classes\Layout) {
             $dataHolder->content = Controller::instance()->parseSyntaxFields($dataHolder->content);
         }
     });
     Event::listen('backend.richeditor.listTypes', function () {
         return ['static-page' => 'rainlab.pages::lang.menuitem.static_page'];
     });
     Event::listen('backend.richeditor.getTypeInfo', function ($type) {
         if ($type === 'static-page') {
             return StaticPage::getRichEditorTypeInfo($type);
         }
     });
 }