I am new to MM Framework

I have creted a form base on CbizObjMaintenanceForm an added a third page and drop my BizObj on it and changed cparentbizobj to ClistOneToManyObj1, cuniqueidfield is cID and nrequerytype to 1. I do
not understand why the child BizObj record pointer does not move when the Parent BizObj record pointer moves.

What am I doing wrong?