Member of group wheel, but still can't shutdown system?

[thomas at hindsight.de]

Hi All,

I've just installed FreeBSD 6.1 and listed myself as a member of the wheel 
group during the add users portion of the installation.  For some reason I 
have not put a finger on yet I cannot shutdown the system "do not have 
permission" to effect the command.  Went back as root on a later session and 
re-entered my name in /etc/group to the wheel account to no avail, anybody 
got an idea as to where I need to look?

Thanks,
Tommy2