"Next window" shortcut under gnome Suse 11.2

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http://forums.opensuse.org – I use gnome and connect via VNC. I usually change the shortcut that let's me cycle through windows (like Windows <alt-tab>) to something else like <ctrl-tab> which will work when I connect via a windows client.. But in the keyboards shortcut configuration, I don't see the option, at least under 11.2. Can someone point me in the right direction? (Distributions)