How do you get Microsoft.UI.Xaml.Window instance from a custom SystemBackdrop implementation?

[HO-COOH]

I am implementing a custom SystemBackdrop based on DesktopAcrylicController, however, I want it to be listen to window.activate event. I am having difficulty retriving the Microsoft.UI.Xaml.Window instance in my custom SystemBackdrop code.

I do figured out how to get the content inside the Window with this code:

	void CustomAcrylicBackdrop::OnTargetConnected(winrt::Microsoft::UI::Composition::ICompositionSupportsSystemBackdrop const& connectedTarget, winrt::Microsoft::UI::Xaml::XamlRoot const& xamlRoot)
	{
		xamlRoot.Changed([this, target = winrt::make_weak(connectedTarget)](winrt::Microsoft::UI::Xaml::XamlRoot const& root, winrt::Microsoft::UI::Xaml::XamlRootChangedEventArgs const& arg)
		{ /*root.Content() is the direct child inside the Microsoft.UI.Xaml.Window*/ }
        }

[codendone]

There's no way to walk from those parameters back to the Window.