I can't get my page's title to display in the navigation bar.

I can't tell if this is a bug or if it is a consequence of making a bad architecture decision.

Consider an application with many pages related in this way:

• FirstPage has some fabulous OpenGL view that does cool stuff. It doesn't have a navigation bar. This includes a button that launches...
• MenuPage, which displays buttons that launch other forms, but those aren't required for this demo.

There are several things I've tried.

In the initial approach, I start FirstPage the most obvious way (note I'm not wrapping it in a NavigationPage):
public static Page GetMainPage() {
return new FirstPage();
}

FirstPage is really simple, here's just the constructor content:

var lbl = new Label() { Text = "Pretend this is a big complex full-page element." };

var btn = new Button() { Text = "The important thing" };
    btn.Clicked += (s, e) => {
    Navigation.PushModalAsync(new NavigationPage(new MenuPage()));
};

var layout = new StackLayout();
layout.Children.Add(lbl);
layout.Children.Add(btn);

this.Content = layout;

I had to use PushModalAsync() because that seems to be safe if you're not wrapped in a NavigationPage? I'm not sure on that. It could be why I'm having trouble.

I made MenuPage even simpler for the purposes of the demo:
Title = "Menu";

var lbl = new Label() { Text = "asdf" };

var layout = new StackLayout();
layout.Children.Add(lbl);
Content = layout;

With this code, the navigation bar displays on MenuPage, but not the title. The back button doesn't work.

If I modify the PushAsync() call in FirstPage to be PushModalAsync(), I get the title displayed, but the back button on the navigation bar doesn't work anymore.

So I decided that's likely what happens when you don't use NavigationPage start-to-finish, or maybe a side effect of PushModalAsync(). So I changed App:

    public static Page GetMainPage() {
        return new NavigationPage(new FirstPage());
    }

And in FirstPage, used PushAsync() instead. (I also Now the back button works, but MenuPage's Title doesn't show in the navigation bar. If I revert to PushModalAsync(), I get the title but no back button.

Things got more confusing to me when I remembered to put a call to NavigationPage.SetHasNavigationBar() to make sure FirstPage doesn't have the navigation bar, and one in MenuPage to make sure it /does/. If I PushAsync(), I get no navigation bar on either page. If I PushModalAsync(), I get the navigation bar on MenuPage with no title and no back button functionality.

What the heck is going on? Maybe I don't fundamentally understand the difference between modal/non-modal in this context? Maybe your app is supposed to use NavigationPage and always show the navigation bar no matter what? I'm not sure what the right track is.