>
>Cetin,
>
>Thank you very much for the issustrating code. I will go through it to learn more.

Dmitry,
I think you 'added' the BIZ and DA as properies:

this.oBiz = createobject('myBiz')

vs:
this.AddObject('myBiz','myBiz')

First one is a reference pointer and BIZ live outside of form. Probably no need to do that if you don't have a good reason.

PS: VFP do that for Dataenvironment. DE is a property pointing to a DE object.
Cetin