path of a 'closeStackRequest'

[Graham Samuel]

I must be doing something really dumb, but I don't understand what. 
In the app I'm developing (Revo 1.1.1 on MacOS 9.2.2), I have a 
mainstack and a number of substacks. I appear to be getting more than 
one 'preOpenStack' message to my main stack, which since my intention 
is only to open it once during the whole life of my app, is causing 
me considerable bother.

In the absence of a path-tracing feature in the debugger, I therefore 
put this handler into my mainstack:

on closeStackRequest
   answer (the short name of the target)&&"is trying to close the Anchor stack"
   pass closeStackRequest
end closeStackRequest

and went back to testing. I found that when I closed a substack by 
clicking on its close box, the handler in the mainstack got called, 
with the target being the first card of the substack. There is no 
stack script in the substack. What's going on? It looks as if the 
'closeStackRequest' for the substack has got into the message path 
for the mainstack and is being applied to the mainstack, but why? If 
I want to allow closing of some substacks, either by scripting or by 
my user without affecting the mainstack, what do I do?

All explanations gratefully received, and as usual any pointers to 
existing documentation on the subject (I am more than happy to read 
up on this stuff, but I am often puzzled as to where to look).

TIA

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France