SetFocus()

Any ideas what prevents SetFocus() from working? I have a form that reads a value from some calipers. This works fine... However, three readings are required... So after I get a reading for the 1st item, I want to automatically move to the next item.... I put a .SetFocus() on that control, and nothing happens. My set focus on the Form_Load event works, and will place focus where ever I want, but after that, forget it. SetFocus() does nothing. I have tried Application.DoEvents() before the Focus... But Nada. John...