shutdown menu item

Hello,
I put Shutdown in my menu and clicked on Reconfigure, but clicking on 
Shutdown doesn't shut down the computer. I'm using xdm in Debian, and 
here is my .fluxbox/menu:
[begin] (fluxbox)
[include] (/etc/X11/fluxbox/fluxbox-menu)
[exec] (Shutdown) { #!/bin/sh
  gdmflexiserver -a -c 'SET_LOGOUT_ACTION HALT'
  kill -TERM $(xprop -root _BLACKBOX_PID | awk '{print $3}') }
[end]
That's based on 
http://fluxbox-wiki.org/index.php?title=Shutdown_computer_with_dialog I 
also moved it to /etc/X11/fluxbox/fluxbox-menu and clicked Reconfigure, 
but it still didn't work.

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