preOpenStack problem

[Richmond Mathewson]

So, in the most recent version of my Devawriter Pro I have a script in 
the preOpenStack
section of the stackScript:

on preOpenStack
    send "mouseUp" to btn "CHECKIT"
end preOpenStack

btn "CHECKIT" checks the end-user's computer's MAC address
against a list of MAC addresses in a scrolling list field.

When I quit LiveCode LiveCode "throws a bluey" and opens
up the stackScript and puts a "yellow thingy of death" next to
send "mouseUp" to btn "CHECKIT"
and says "no such object"

which is, obviously, rubbish

&

why on earth is LiveCode trawling through "preOpenStack" when it's 
closing the thing?

----

this is not "fatal" as I notice it doesn't happen in a standalone.

----

Richmond.