How to store a stack in a custom property

[Jérôme Rosat]

Hello Everyone,

It's possible to create a new stack from a stack stored in a custom  
property like this:

go stack the uMyStoredStack of stack "mainStack" in a new window

Is it possible to store a stack in a custom property without creating  
first a file ?

The following way doesn't work: set the uMyStoredStack of stack  
"mainStack" to stack "Test"

Thank you for your help.

Jérôme Rosat