I'm a newbie and it seems that I'm a bit confused :)
I have a concept A with child concept B.
Concept B in its turn has an optional reference to concept A (i.e. [0..1]).
I'd like to create an editor for concept B with menu (Ctrl+Space) with list of all instances of concept A. If I have not optional reference, such a menu is generated automatically if I specify primary replace child menu.
But I don't get how to create it in case of optional reference.
Not sure if such description of my problem is clear :)