Business Process doesn't launch in Prolaborate as in Sparx

[matsda]

Hi,
I have a BPMN-defined Business Proccess in Spax that acts as when double-clicking it within a top-diagram (diagram A), it opens the diagram located beneith the Business Process as expected (diagram A.A). It acts in the same way as an composite activity in (diagram A) that points out which sub-diagram (diagram A.B) is to be opened when klicking the + sign in the activity.

So, when moving into Prolaborate, the composite activity acts as above (diagram A.B opens) but the Business Process does not open diagram A.A, it just open up the property of the Business Procssess.

What is the trick to make it acts the same? Is it possible or do I have to change then Business Process into a composite activity (not desiraeable)?

Tia
Mats