Windows 10 and triple Screen

[Renato.D]

i all. I'm running a Windows 8.1 host with 32GB RAM and a Intel i7 Intel CPU
Running Windows 7 e Windows 8.1 virtualbox guest succesfully with 3 monitors defined (and 256MB video RAM allocated).
Installed Windows 10(64bit) but I cannot get triple screen. The guest presents only two video.
The Guest Additions is installed.
The virtual box version is 4.3.30 r 101610.


Does anyone have the Win 10 running as a guest with triple monitors?
Thanks

[Renato.D]

i have update virtual box at 5.0.3.r102322 but the third video is not yet seen

[Renato.D]

i have update virtual box at 5.0.4.r102546 but the third video is not yet seen