Navigation Page in TabbedPage Open New Navigation Page cannot show BackButton

As title, i want to open a navigation page when navigation page listview in tabbedpage.
var home = new NavigationPage(new HomePageCS());
home.Title = "Home";
home.BarBackgroundColor = Color.White;
home.BarTextColor = Color.Black;

            var discover = new NavigationPage(new DiscoverPage());
            discover.Title = "Discover";
            discover.BarBackgroundColor = Color.White;
            discover.BarTextColor = Color.Black;

            var notification = new NavigationPage(new NotificationPageCS());
            notification.Title = "Message";
            notification.BarBackgroundColor = Color.White;
            notification.BarTextColor = Color.Black;

            var profile = new NavigationPage(new ProfilePageCS());
            profile.Title = "Profile";
            profile.BarBackgroundColor = Color.White;
            profile.BarTextColor = Color.Black;

            Children.Add(home);
            Children.Add(discover);
            Children.Add(notification);
            Children.Add(profile);


    var notification = new NavigationPage(new DetailPageCS(item));
                    notification.Title = "Message";
                    notification.BarBackgroundColor = Color.White;
                    notification.BarTextColor = Color.Black;
                    NavigationPage.SetBackButtonTitle(this, "Test");
                    NavigationPage.SetHasBackButton(notification, true);
    await Navigation.PushAsync(notification);
    await Navigation.PushModalAsync(new DetailPageCS(item));
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