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>I knew the syntax I used was 'sus' but I was surprised at the result. BTW, why bother with the 'This.o=Null' - when wouldn't o go out of scope when c1 is destroyed anyway ?

I don't want to leave anything to a chance. I consider a good programming practice to excplicitly release such objects.

>Also I see that although VFP9 (at least in the beta) flags up the error it only does so AFTER creating c2 and is inconsistent in subsequently releasing it.

Error is only generated if object is assigned to a property this way. Any other type of data doesn't generate an error. I'm not sure what inconsistency you're refering to.