code: protected void ensureNotifications() {
  
          I_CmsNotificationWidget oldWidget = CmsNotification.get().getWidget();
          if (oldWidget == null) {
              CmsNotificationWidget newWidget = new CmsNotificationWidget();
              CmsNotification.get().setWidget(newWidget);
              RootPanel.get().add(newWidget);
          }
      }
docs: Make sure a notification widget is installed.<p>