NavigationService.OpenAsync() does not open a new Window about template10 HOT 4 CLOSED

 public async Task<int> OpenAsync(Type page, object parameter = null, ViewSizePreference size = ViewSizePreference.UseHalf)
{
            var coreView = CoreApplication.CreateNewView();
            int viewId = 0;
            await coreView.Dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
            {
                var nav = BootStrapper.Current.NavigationServiceFactory(BootStrapper.BackButton.Ignore, BootStrapper.ExistingContent.Exclude);
                var frame = nav.Frame;
                frame.Navigate(page, parameter);
                Window.Current.Content = frame;
                Window.Current.Activate();
                viewId = ApplicationView.GetForCurrentView().Id;
            });

            // show view
            if (await ApplicationViewSwitcher.TryShowAsStandaloneAsync(viewId, size))
            {
                // change focus
                await ApplicationViewSwitcher.SwitchAsync(viewId);
            }
            return viewId;
}