call a function in a decision step

[Dimitri Dupont]

Hello,
My question is. In a decision step is it possible to add a user =
controlled button that would call a function.
In this case 'ARCHIVOBJECT_DISPLAY'.
The idea is to allow a person to preview a certain document before =
taking his decision.
The version I work on is 4.6C and the form step does not exist in that =
version.
All optiosn are open
Thank you in advance
Dimitri