FC6: Restart/Shutdown buttons at X logout: how to disable?

[Rob <spamrefuse yahoo com>]

Hi,

I'm using FC6 with XFCE as my X manager.
 
If a regular user logs in via the main Xlogin screen,
then upon logout appears a confirmation window that
has three buttons:
   [logout] [restart] [shutdown]
which allows this user to restart or shutdown the PC.
I would like to disable this.

Modifying /etc/sudoers, as documented by XFCE,
has no effect at all.

Is on Fedora Core 6 the restart/shudown policy
configured by dbus/hald?
If so, then how do I change this behaviour?

Thank you,
Rob.



 
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