Thanks for the suggestion, but I tried it, and still no joy (the list box is not updated until I click on it).
By the way, I have the code in the following places: Init and Click method of the form, GotFocus of the list box, and Init and InteractiveChangeEvent of the combo box (except in the latter I refresh only formverlist). I also tried changing thisform.refresh to thisform.formverlist.refresh everywhere with no visible change in effect.