public MainViewModel() { Mediator.Register(this, (AddModuleMessage message) => CurrentPage.AddModule(message.Module, false)); Mediator.Register(this, async(DialogRequestMessage message) => { object response = await DialogHost.Show(message.DialogContent, "RootDialog"); if (message.ResponseToken != null) { Mediator.Send(new DialogResponseMessage(response, message.ResponseToken), message.ResponseToken); } }); Mediator.Register(this, async(NotificationMessage message) => { LastNotification?.Hide(); LastNotification = NotificationService.CreatePredefinedNotification(message.Caption, message.Content, null, message.Image); await LastNotification.ShowAsync().ContinueWith(task => { if (task.Result == NotificationResult.Activated) { App.BringToFront(); int pageIndex = PageCollection.GetPageIndex(message.Module); if (pageIndex >= 0) { SelectedPageIndex = pageIndex; } Properties.Settings.Default.IsCollapsed = false; } LastNotification = null; }); }); }