There is a textbox. The interactivechange procedure would like below:

* txtSearch.InteractiveChange
With ThisForm
  .lockScreen = .t.
  .....
  .OtherObject.otherAction()
  .OtherObject1.otherAction1()
  * .List1.Value = .List1.List(.List1.ListCount) && Example
  * .List1.Value = SeekValue
  .....
  .lockScreen = .f.
EndWith

If user wait all the subrountine Actions to finish first,
it would be fine. It works as wish.
The problem is if the user key in too fast!
The above procedure will recall at once and cause problem
as the previous call is not completed!

In above cases, the list box do not finish the location but
the above code already recall!
Even I add the code at lockScreen Statement .Enabled = .f.

Actually, the problem is not disallow the program to fork into
multi-tasking on external function call for some key reasons.

Of cos, Maybe cannot be solved as Visual is like XView.
Take Action according to events and cannot force to do linear task.
But it will become problem if the coding are not sure to complete
and take other events to work!

Similar situation is the user exit too fast but the saving task not
finished yet!