How to retrieve the `Source` attribute value of an `AnimatedVisualPlayer`?

[lfmissonb]

I'm currently exploring how the Windows taskbar works and came across this fascinating project—UWPSpy. I noticed that the Windows logo is implemented as an AnimatedVisualPlayer. However, in UWPSpy, the AnimatedVisualPlayer's child appears to be the Handout Visual attribute, not its Source attribute.
Is it possible to inspect the value of the Source attribute of this AnimatedVisualPlayer?
(I'm not very familiar with UWP and XAML Islands.)
Thanks!