an unknown problem

[samueltian666]

        var content = new NotificationContent
        {
            //ignore other options
            LeftButtonAction = () =>
            {
            // it will display and close instantly, without any exception happened 
            // but OnDialogClosed is triggered correctly. This is  prism's IDialogService
            // can't find the reason
               dialogService.Show("MessageWindow");
            // same problem ,It should be blocked
                dialogService.ShowDialog("MessageWindow");
            },
        };
        notificationManager.Show(content);