>Unfortunately, I'd really like to stay away from the Wait Window for this particular thing and use a messagebox instead.
>
>It looks like Dorin's method is the best way for me.
>

Mine is an explanation not a solution.

Valid is not remarkable.
1. I recommend you to avoid to use NODEFAULT in LOSTFOCUS ( IT IS WRONG )

better:

* txt valid
RETURN thisform.chkTxtBox()

but:

* command gotfocus
if thisform.txtOk  && coming from the textbox
  keyboard '{enter}' PLAIN
endif
thisform.txtOk = .F.  && reset coming from the textbox

destroy keyboard tab moving.