Video Fullscreen not stable

I use a mac pro with 3 screens, and Nuendo 6…
I just want to point out that when I put a video in full screen mode on my second or third monitor,
then if I click the finder (or on any other application for that matter) the video will exit the full screen mode.
Logic X does not have that issue (so I know it’s possible to fix it), In Logic I can put my video full screen on the second monitor and if ever I need to access the finder the video will stay full screen…
Is there a way you guys at Steinberg could fix that bug?
What’s the alternative despite using a blackmagic (which I have but don’t want that option anymore)