def evcbMainCam(iScene, iEventType):
	if (iEventType & poser.kEventCodeACTORSELECTIONCHANGED):
		cMain = scene.ActorByInternalName("MAIN_CAMERA")
		aCurrent = scene.CurrentActor()
		if not aCurrent.IsCamera():
			cMain.SetParent(aCurrent)
			scene.DrawAll()

scene.SetEventCallback(evcbMainCam)