Service destructor is not called when component is unloaded

edit

This behavour can be reproduced by simple test

class MyService : public RTT::Service {
public:
    MyService(TaskContext* owner) : Service("myservice", owner)  {
         cout << "MyService constructor." << endl;    
    }

   ~MyService() {
        cout << "MyService destructor." << endl;
    }
};

and then load myservice in any component.

It seems to be caused by boost::shared_ptr loop in RTT::Service definition:

typedef std::map< std::string, shared_ptr > Services;
Services services;
...
shared_ptr parent;

What is cause of such design? Why should children owns it's parent? I can not imagine use case when we need preserve Service when coresponding component is being destructed.