[xmonad] virt-manager guest view and xmonad

Hi, I'm running xmonad as wm for gnome3 on Debian stable and a virtualized Debian unstable also with gnome3 and xmonad. I view the guest with the viewer integrated in virt-manager (spice). mod-buttonN work on the viewer instead of being propageted to the guest and effecting the client window running in the guest. mod-[1-9] for example work inside the guest and switch workplaces inside the guest. But I want to modify windows inside the guest. Do you have any hint for me? I have modMask = mod4Mask, so my mod key is the windows key. Regards, Thomas Koch