Right for option A. You have to be carefull and make sure that you release the pointer in the Release event of the biz class if you go that way. For option B, you're not creating circlic references if the property is (for exemple) a string. You're just passing a string value to the biz class, not a pointer to the parent.

>I haven't read the whole thread, only this message, but I agree that only C option is a valid one. With A & B you're creating circlic references problem and you would not be able to release the form.