[Closed] max sdk '13 group modifier

Hi, i created a simple exporter. Now i want to do able set some user data to objects in the scene. To achieve this, i want to create own modifier, not script, but i am new in maxsdk so dont even know how to do it. I need a very simply modifier to make possible to attach objects to each other and after move them synchronously. I’ve looked up samples, but dont found any usable. Can you advise something to start.