Have you tried SET ASSERTS ON and place an ASSERT at the beginning of the code in the combo class? Or set a break point at the beginning of the combo code.

>An error ocurred (while instatiating a combobox it seems) and I need to see the cause, but the call stack is empty! That means you can't see trace either.
>
>I am using the VFP first level base classes as my starting point. (The ones in _base.vcx) Can this be the problem ?
>
>TIA,
>
>Alex