Unable to take screenshot of app in Virtualbox

Hi,

From the start I want to iterate that this is my first post on the forums and I hope I am in the right place.

I am troubled by the following issue:

I have an application made in Adobe AIR (League of Legends game client) that runs inside a VirtualBox VM (which uses WineD3D for Direct3D).

When I try to take a screenshot of the application the screenshot shows only stuff that is behind the app as like the app is fully transparent.

How is this possible?

What am I doing wrong?

Your input is much appreciated.
Thanks

Message was edited by: RomanuX