XFCE shutdown and reboot

i am using xfce4 at the moment, nice and fast wm (not as fast as fluxbox though ;) ).

anyhow, when i want to shutdown, the only item i can chose is to logout. shutdown and reboot are greyed-out and cant be selected.
i googled for this problem and found a how-to to fix this, by making an new group called "shutdown", giving the "shutdown" group halt and reboot permissions through sudo and then adding my users to that group.

suposedly, that should have fixed the problem, but it didnt, i still cant select reboot or shutdown. :confused:
any ideas?

thanks in advance!

If you can use a terminal...

Code:

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man shutdown
man reboot

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i.e.:

Code:

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shutdown -r 10

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It shutdowns the system in 10 minutes and reboot.

;)