public static void ShowEventDetail(Event _Event, bool _IsModal = false)
 {
     NavigationService.PushAsync(new ProductItemViewPage(_Event, _IsModal));
     SetPageTitle(_Event.CAPTION);
     CommunicationService.CancelAllRequests();
 }
 public async static void HandleLoadingError()
 {
     CommunicationService.CancelAllRequests();
     NotificationService.ShowAlert(Messages.ERROR, Messages.LOADING_ERROR, Messages.CLOSE);
     // TODO BACK TO START SCREEN
 }