finding the name of the target's stack in a script

[Ben Rubinstein]

On 24.07.2012, at 17:33, Dr. Hawkins wrote:
 > I have a handler that needs to handle an event differently depending
 > upon which substack the button calling it is on.

You could use "the owner" to walk up the heirarchy from the target - eg create 
a function "owningStack" which successively gets the owner of its parameter 
(originally the target) until it gets a stack?