How to Close FlyLeaf Window On MouseDown

Question

I'm using FlyLeaf to play videos and intend to close the Window (or Overlay or Player) on MouseDown event. How do I go about it?

I've tried listening to the Window's MouseDown event but it does not get triggered.

Based on the document, it seems like I have to listen to the Overlay's MouseDown but I'm getting null reference to the Overlay.

flyLeafHost.Overlay.MouseDown += Overlay_MouseDown;