[Zope] CatalogQuery-0.1 not showing in the drop-down menu

Hello I just installed the CatalogQuery-0.1, and restarted zope, there were no errors nor tracebacks. BUT, I don't seem to be able he product from the drop-down menu as is not in the options to select from. This is my setup: Zope Version Zope 2.3.3 (source release, python 1.5.2, linux2) Python Version 2.1 (#1, Jun 6 2001, 14:18:24) [GCC 2.95.2 19991024 (release)] There was similar problems, before with ZMySQLDA and ZGadfly, where both Products ware shown as installed, but were unavailable in the drop-down menu. here is the link of the solution, i think http://lists.zope.org/pipermail/zope/2001-June/092803.html Norman