.Map :: MoHAA Mapping

This is my first time using MOHRadiant, so I may be missing something obvious. However, I am attempting to make rain on my map. I followed the tutorial here and everything works fine, except that I can't seem to apply func/rain to my brushes. When I right click on the selected brush, and go to 'func' the only option is 'ladder'. What's going on?

hmm wierd - have you moved your entsdef.pk3 into your mohaa main directory ??