[CommonUI] Inside an ActivatableWidgetStack, how do I prevent the input to be routed to widgets below the topmost one?

Development Programming & Scripting UI
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Hello,
I have an ActivatableWidget that is displayed on top of others to simulated a classic prompt:

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image1248×275 37 KB

Ignore the missing style for the prompt, it’s an issue I hope to resolve, already opened a question here >:(

Now, as you can see, the prompt is displayed, but the menu under it can still receive focus, and I don’t want that.
Is there some kind of “Application Modal” like in Qt? Or the MessageBox you get with Win32?
I want the widget at the top of the stack to consume all the input and nothing shall passthrough.

Thanks,
Stefano