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Created attachment 25868 [details]
Repro solution set up to add to a navigation stack for testing.
The mouse back button in UWP seems to navigate back in a navigation stack, but in Xamarin.Forms it seems this only works if you are mousing over a control.
0. Get a mouse with a back button
1. File > New Forms solution
2. In App.xaml.cs, make the app run in a NavigationPage
3. In Main.xaml/.cs make a way to add more to the page stack (e.g., button that pushes another MainPage; see attached project)
4. Run app on local UWP machine
5. Navigate deeper a few pages
6. Mouse into some whitespace in the app (e.g., between the "Welcome to Xamarin.Forms" label and the button added in step 3
UWP should navigate to the prior pages in the NavigationPage stack with each press of the mouse back button.
The mouse back button will not do anything unless you mouse over a control (e.g., the "Welcome" label or the button from step 3).
## System Info (excerpt)
Microsoft Visual Studio Enterprise 2017
Microsoft .NET Framework
Installed Version: Enterprise
Visual Basic 2017 00369-60000-00001-AA352
Microsoft Visual Basic 2017
Visual C# 2017 00369-60000-00001-AA352
Microsoft Visual C# 2017
Visual Studio Tools for Universal Windows Apps 15.0.27004.2010
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.
Xamarin 188.8.131.52 (34c1b6c)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android SDK 184.108.40.206 (HEAD/c2a33d8ea)
Xamarin.Android Reference Assemblies and MSBuild support.
Xamarin.iOS and Xamarin.Mac SDK 220.127.116.11 (51128b8)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.