protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            rootPage = MainPage.Current;
            var accountProvider = ((App)Application.Current).AccountProvider;

            RefreshButton.IsEnabled = (accountProvider.SignedInAccount != null);
            if (accountProvider.SignedInAccount != null)
            {
                Description.Text = $"{accountProvider.SignedInAccount.Type} user ";
                if (accountProvider.AadUser != null)
                {
                    Description.Text += accountProvider.AadUser.DisplayableId;
                }

                notificationCache = ((App)Application.Current).NotificationProvider;
                notificationCache.CacheUpdated += Cache_CacheUpdated;
                notificationCache.Refresh();
            }
        }
 private void Button_Refresh(object sender, RoutedEventArgs e)
 {
     rootPage.NotifyUser("Updating history", NotifyType.StatusMessage);
     notificationCache.Refresh();
 }