Lenovo ABNT2 (pt-br) keyboard - / and ? keys don't work

[fs.antunes]

I am using a Lenovo ABNT2 (portuguese Brazil) layout keyboard, Linux Host and XP and Win7 guest. In this laptop the RIGHT CTRL was substituted to / and ? keys. So I changed the VirtualBox host key to ALT GR. The host key works fine in the VM GUEST, but the RIGHT CTRL was not passed to the guest when a pressed it.

I already tried to catch the code of the key pressed inside the VM guest using a listen keyboard key pressed programs, but RIGHT CTRL is dead.