[CentOS] AltGr over vnc not working

I notice that when I connect from a Windows VNC client (any VNC 
distribution it seems) to the Centos desktop (Gnome) I cannot send AltGr 
key combinations. The vncserver on the CentOS side is vino from Gnome. I 
cannot check if the same happens when connecting from a CentOS machine to 
a CentOS machine, but it looks more like Gnome simply ignores AltGr when 
sent over VNC. Why would it do this? Where might I be able to change this?

Kai

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Kai Schätzl, Berlin, Germany
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