[Zope] Making ZCatalog catalog the results from a ZSQL query

Greetings, How can I make a ZCatalog object to catalog the result set produced from a ZSQL method? I'm subclassing ZCatalog and replacing the default manage_catalogFind with a DTML method which in turn invokes a ZSQL method, but I get an error, "You are not authorized to access SQLPatientSearch." (SQLPatientSearch is the ZSQL method). I think I've set all permissions right, so I don't know why I get this, but I was wondering if someone can come up with an easier way to do this. Thank you very much, Ivan Raikov