>I have a listbox on a form, data supplied by 2 fields: descr, id . BoundColumn - 2. Control Source: Thisform.nID . BoundTo = .T. as I want the id number stored as the form property and not the index number of the chosen line.
>
>When I select a row in the listbox it highlights but as soon as the mouse is released the highlight clears. If I set BoundTo = .F. the behaviour is as I would like i.e. the selected row in the listbox remains highlighted.
>
>Any idea what I am doing wrong?

I like to use properties as ControlSources, but over the years, I have run into issues with lists and combos when I do so. I can't say for sure, but this may be one of them.

Try getting rid of the ControlSource and adding code to Valid to keep your property in synch.

Tamar