Windows 8 - no visual for function keys

Hi everybody

I have installed Windows 8 64-bit Professional on my 2012 Macbook Pro 15, and everything works great, except for one thing.

This "graphic" that shows on osx (and back when I ran windows 7), whenever you adjust brightness, volume, etc. on the F-keys, does not show up. I have tried to google the issue, but I cant seem to find anybody with a similiar problem.

Does anybody know how to fix this?

Thank you, in advance!

Best regards,

Mikael