[CentOS] gdm in 6.2 missing keyboard menu?

I have a box running 6.0 that gives a keyboard layout menu via gdm when 
logging in.

I've just installed a 6.2 box, but there is no keyboard layout menu

I've found a bugzilla entry at:

  <https://bugzilla.redhat.com/show_bug.cgi?id=746923>

which says that with gdm in 6.2, it now only shows keyboard layouts 
listed in /etc/sysconfig/keyboard

However, I've added a list of keyboard layouts as suggested by that BZ, 
but I still don't get a keyboard menu.

Is there anything else I've missed?

Thanks

James Pearson