private async void delete_ibtn_Click(IconButtonControl sender, RoutedEventArgs args)
        {
            ConfirmDialog dialog = new ConfirmDialog("Delete TUM ID and Token", "Do you really want to **delete** the local copy of you TUM ID and TUMonline token?");
            await UiUtils.ShowDialogAsync(dialog);

            await VIEW_MODEL.DeleteTumOnlineTokenAndIdAsync(dialog.VIEW_MODEL);

            // Show the info dialog:
            ContentDialog restartingDialog = new ContentDialog
            {
                Title           = "Restart Required",
                Content         = "The app will restart shortly to apply those changes...",
                CloseButtonText = "OK",
                DefaultButton   = ContentDialogButton.Close
            };
            await restartingDialog.ShowAsync();

            // Restart App:
            SharedUtils.RequestAppRestart();
        }