>I've got a form which is based on a class and a listbox on this form. The listbox is also based on a listbox generic class. The ItemTips property of the listbox control on the form is set to .T. and the ShowTips property of the form is also .T. (I'm not sure if this is needed, but anyway).
>Still there are no item tips displayed when the mouse cursor is positioned over an item in the listbox. There is no error message either. Just nothing happens.
>Has anyone any idea as how to fix this problem?

Try the ItemTips property.

HTH!