If you use another Window on WinUi3, you will get an Error. Do you know how now?
CodePudding user response：
Creating new windows is currently not supported in the stable release (version 0.8.2) of WinUI3.
If you install the latest release of the experimental channel (version 1.0.0-experimental1), you can however create and display new windows like this:
var win = new Window();
win.Activate();