How to open a new Window in WinUI 3 for Desktop

I have a xaml file that has a Window inside

<Window
    x:Class="MyProject.MyWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Grid>
        <!-- The content of the window -->
    </Grid>
</Window>

In previous versions, don’t remember which, I was opening the window with the following code

var form = new MyWindow();
form.Activate();

but it is not working anymore. How should I open a window?

[tinmac]

@marb2000 Is there an issue/discussion I can track to keep up to date with multiple window support? Thanks.

[float34]

Window in Windows can’t create a new window, that’s what one should expect.