cwm bind-key with space

Hello,

I am trying to used Mod4 + space to bind a key to a script, but I seem to
not be able to find out what is the name of the keysym key. "Space" is not
working. I have tried to pick up the name
from /usr/X11R6/include/X11/keysymdef.h

---> "XK_KP_Space" or "0xff80"

but neither is recognised by cwmrc.

What am I doing wrong? Thanks!

thanks