code: @Override
  	public void initUpstream()
  	{
  		for (Entity entity : interaction.getParticipant())
  		{
  			addToUpstream(entity, getGraph());
  		}
  		for (Control control : interaction.getControlledOf())
  		{
  			addToUpstream(control, getGraph());
  		}
  	}
docs: Binds to participants and controllers.