"unsetting" behavior

[Dr. Hawkins]

I'm looking at the need to be able to set & "unset" behaviors.

If I have set the behavior of a field to some button, and then want it
to go back to default behavior, is there any way to do this?  Do I
need a null script?

And how long does a "setting" last?  While I"m o the card? While the
stack is open?  While the mainstack is open?

-- 
Dr. Richard E. Hawkins, Esq.
(702) 508-8462