There is no way documented how to snap objects inside other objects.
- The functionality should be similar to the objects of type "swimlane" – object should allow or deny other objects to be inside of it.
- When this object is moved around, snapped-in objects should move too. Swimlanes have similar functionality except they can't be moved around (they dock to the side or top of the drawing area).
- Is it possible to create classes with object snap-infeature, but which do not subclass "__D_swimlane__" class and do not have mentioned side effects?