Description

I'm using TitleBar without setting BackgroundColor (I would like to stay with system default colours). When I change theme using system settings TitleBar correctly responds to this changes. But when I change UserAppTheme TitleBar colour won't be updated (even after app restart)

Steps to Reproduce

1. Create empty MAUI solution
2. Add buttons which on click would set for example Application.Current.UserAppTheme = AppTheme.Dark;
3. In App.xaml.cs change CreateWindow to:

    protected override Window CreateWindow(IActivationState? activationState)
    {
        var window = new Window(new AppShell());
        
        window.TitleBar = new TitleBar
        {
            Title = "MauiApp1",
            Subtitle = "Welcome to .NET MAUI",
            ForegroundColor = Colors.White,
            HeightRequest = 32
        };
        
        return window;
    }

I'm using Microsoft.Maui.Controls 9.0.81

Link to public reproduction project repository

No response

Version with bug

9.0.10 SR1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

macOS, Windows

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output