Calling a MySQL Stored Procedure in a list page

I have a complex MySQL Stored Procedure that I want to use for a List Page
WHen the user clicks on the menu item, I open the Search Page. It opens the Advanced Search and that appears to work.
I want the user to fill in the criteria, then I want to construct my call to my stored procedure and call it. I assume I can do this in the Custom Query of the List Page?? To test this I am just calling the stored procedure and hardcoding the value.
So this goes in teh Custom Query section
return DB::Query("call sp_SearchBA2(null,null,'AZ',null,null,null,null,null,null,10)");This should query for rows with state of AZ and return 10 rows max.
In the fetch records event I have this:
return $rs->fetchAssoc();and I don't care about counting the number of records that I get back but I hardcode this in the Get Row Count
return 10;My problem is that the results come back ignoring my call to the stored procedure, so in other words if in my search is say state = NM, I get just New Mexico records in my list.
Can someone tell me what I'm doing wrong?
Thanks in advance
Alan