User shutdown from xfce4 or gdm

[Donald Perkovich <donp@mindspring.com>]

I am using gdm and xfce 4.0 and would like to be able to shutdown
as my normal user without giving a password.  It seems like this
is possible.  Xfce4 gives a message when I try to shutdown when I
log out that I must install sudo or put the user name in
/usr/xfce4/shutdown.allow.  Both are set and the result is the same
as before.  I've given the user permission to execute shutdown,
halt and reboot sans password.

The docs show how to do it with xfce 4.2, but there is no mention
in the 4.0 docs about it that I can find.  I didn't find anything
in the gdm docs about it either.  Did I miss it?

Don