How to associate UIElements with an AppWindow in WinUI3

Question

What I want to do:

I want to add UI elements to an AppWindow in my WinUI3 desktop application using the Windows App SDK and C++.

The problem I am having:

I followed the documentation to create a new window for my desktop application with the AppWindow class.

Show multiple views with AppWindow However, I am having difficulty associating UI elements with the new window. Unlike with the Windows.UI.Xaml.Hosting.ElementCompositionPreview class, the Microsoft.UI.Xaml.Hosting.ElementCompositionPreview class does not have a SetAppWindowContent() method. Therefore, I cannot associate UIContents with the newly created appWindow. I am hoping for a simplified explanation of how to set an element on a newly created window. I would also like to know if it is possible to set a Window element other than the MainWindow or a Page element.

Answer 1

Hello @hasechon,

The Show multiple views with AppWindow document refers to Windows.UI.Xaml.Hosting.ElementCompositionPreview which you should use.

Also

Note AppWindow is currently in preview. This means you can submit apps that use AppWindow to the Store, but some platform and framework components are known to not work with AppWindow (see Limitations).