>I'm working on my very first VFP 3.0 application. In my Add/Edit/Delete Form, I am adding code to the LostFocus event of a date field to make sure the date entered/edited is within a certain range. If the date entered is not valid, a message box pops up informing the user of this. I then want the date data entry field to have the focus. However, the ThisForm.txtDate_of_Accident.Setfocus command does not work. I can substitute any other control name and it works fine.

If you are already on that control, you don't need to use the LostFocus() for validation. Use the Valid() event and RETURN 0 when it failed.