Is it possible to clone a stack and the user does not see anything ?

[André.Bisseret]

Hi,
In a handler I am cloning a stack, say, « substackModel »
Something like :
------
lock screen
clone stack "subStackModel"
   close stack "copy of subStackModel" -- to minimize the time it is  
visible
   set the name of stack "copy of subStackModel" to suchName
   set the mainStack of stack suchName to «thisMainStack »
   etc ...
-------
Despites the « lock screen » and the second line which close the new  
stack as soon as it has been created, the new created stack appears  
for a while.

Is it possible to do that invisibly  ?

Any advice ?
Thanks a lot in advance

Best regards from Grenoble (surrounded by white moutains for two days  
now !! :-)))
André