How to change weldment group trim order using API?

Hello, I'm trying to change the trim order of a weldment group using the API. I can't find a reference in the API docs and the macro recording doesn't seem to record the event.

I'm talking about this specific trim order:

From the StructuralMemberGroup I can only select the CornerTreatmentType.

Thanks in advance.

SolidworksApi/macros