I noticed in the help file for the Valid Method
That you can return either numeric or Logical values.
I tried the numeric and it worked great (0 to stay, 1 or greater to advance the focus), but the Logical .F. will
be handled differently with a wait window that will inform the user of 'Invalid Input'. The help documentation does not indicate this and can be a pain if you are validating a Grid field.

Microsoft has been informed, just thought I would let this group know also.