determine if an object is part of a ROD

Is there a clean way to tell if a shape in a cellview is part of a ROD (actually MPP is what I'm interested in but other forum answers talk about that piece). foreach(fig cv->shapes when(shape_is_part_of_rod(fig) ;; objType) ) ) I can picture some crazy things like making a table that I populate with all shapes by iterating on RODs and then subShapes and then see if a given figure ID is found in that big table but that seems like a lot of work for a simple check. Thanks -Dan