[Zope] problem with catalog avareness

hi all, i made a catalog aware class and want to use it with a catalog. i'm running zope 2.1.4 on a nt server (sp5). when i add the catalog aware object, it is automatically listed in the catalogs 'catalog' tab, but the indexes are not automatically updated (when i want to search them with a search interface, they do not exist). strange thing: when i copy the object in the manage enviroment, an paste it afterwards at same place, everything work fine! can someone help me! thanx