popUp a button with itself on modified mouseDown?

[Dr. Hawkins]

I'm trying to get a button to normally be a boring old popup, but allow
other things to be chosen by it.

The "natural" way would seem to to change it on mousenter if the specified
modifier key is down, or if the second button is clicked.

I get the change to happen trivially, but if I'm doing it from a mouseDown,
I can't get it to display itself.  I'm trying things like,

on mouseDown bt
   if bt=3 then
      popup  button the short name of the target
   end if
   pass mouseDown
end mouseDown

But I'm not finding a magic combnation
-- 
Dr. Richard E. Hawkins, Esq.
(702) 508-8462