//copyable interface, implementing the Copy function, used by PolyDeepCopyNew
template<class T, class B = EmptyClass>
class Copyable : public B
{
public:
	virtual ~Copyable() {}
	virtual T* Copy() const { return new T(); }
};

//this is a nice helper, meant to be used like i.e. PolyCopying<EditCtrl>
//assigning Copy'ed instances to PolyCopying<Ctrl>* with a cast, as Ctrl is direct base class of EditCtrl
template<class T>
class PolyCopying : public Copyable< PolyCopying<T>, PolyDeepCopyNew<PolyCopying<T>, T> > {};

////

	PolyCopying<EditInt> abc;
	PolyCopying<Ctrl>* pabc = (PolyCopying<Ctrl>*)abc.Copy();
	PolyCopying<Ctrl>* pabc2 = pabc->Copy();

	Add(pabc2->HSizePos().TopPos(0,100)); //crashes here
	delete pabc2;