MDG - How to extend BPMN2.0

(This post is a question. It's created here with the purpose of being able to link to it from certain web discussions. But, of course, if you happen to know the answer, you are very welcome to present the answer here)


MDG - How to extend BPMN2.0


I'm trying to extend BPMN2.0 in my own MDG  (still on EA 10).

I don't succed in using the MDG helper wizards - in the miscellaneous drop-down boxes I cannot choose from BPMN elements.

I have managed to extend the BPMN2.0::Activity like this without the MDG help wizards:

Notice that the extended element (at top) is a stereotype element, not a metaclass element!
I tired to make use a metaclass element but have not succeeded in that.

Well it creates a valid MDG, and it appears in my toolbox and I can use it on my diagrams. It also has all the BPMN2.0::Activity tags.

But problem:
1) When I add it to a diagram the usual auto-pop-up menu prompting the user for tasktype does not appear!
2) In the tags pane, the tags cannot be presented grouped in compartments - only alphabetically sorted!

Especially the first of the above two problems will be very unpopular among users.

So how do I create a proper MDG extension for BPMN2.0?

(I have seen and checked menroy's post, http://www.sparxsystems.com/cgi-bin/yabb/YaBB.cgi?num=1412945447/28#28)