WindowNotificationManager can't be used immediately after creating

Click the interface test button, the notification cannot be displayed and the error will be reported directly

@ForNeVeR @mterwoord @vmrocha @lontivero

 private void btn_TestClike(object sender, RoutedEventArgs e)
        {
            WindowNotificationManager _notificationManager = new WindowNotificationManager(this)
            {
                Position = NotificationPosition.TopRight,
                MaxItems = 3
            };

            _notificationManager.Show(new NotificationModel
            {
                Title = "1234",
                Message = "12345",
                Type = NotificationType.Information,
                Expiration = TimeSpan.FromSeconds(100000)
            });


            //NotificationManager.Show(new NotificationModel{ 
            //    Title = "Hey There!", 
            //    Message = "Did you know that Avalonia now supports Custom In-Window Notifications?" });

        }

public class NotificationModel: INotification
    {

        public string Title { get; set; }
            public string Message { get; set; }

            public NotificationType Type { get; set; }

            public TimeSpan Expiration { get; set; }

            //public Action OnClick { get; set; }

            //public Action OnClose { get; set; }



        public Action OnClick => () => Console.WriteLine("helloworld");

        public Action OnClose => () => Console.WriteLine("Stw");

    }

[HossamElwahsh]

Probably too late but if anyone facing the same issue, this is the correct way to show it directly as per maxkatz6 instructions

var not = new Notification("Test", "this is a test notification message", NotificationType.Success);
        var nm = new WindowNotificationManager(this)
        {
            Position = NotificationPosition.BottomRight,
            MaxItems = 1
        };
        nm.TemplateApplied += (sender, args) =>
        {
            nm.Show(not);
        };

[coraxx]

If somebody has the same problem I had. I was initializing it in the MainWindow’s ctor but it did not show for me. Only after moving it to e.g. Window_OnLoaded:

private void Window_OnLoaded(object? sender, RoutedEventArgs e)
{
    _notificationManager = new WindowNotificationManager(this)
    {
        Position = NotificationPosition.TopRight,
        MaxItems = 5
    };
}