template <class P>
class AWindow : public P { 
public:
	typedef AWindow CLASSNAME;

	void Calc()
	{
		if (!Accept()) return;
		result <<= ((int)~op1 + (int)~op2);	
	}
protected:
	AWindow()
	{
		CtrlLayout(*this, "Base class");		
		
		op1.NotNull() <<= 1;
		op2.NotNull() <<= 2;
	}
};

class BWindow : public AWindow< WithBWindowLayout<TopWindow> > {
public:
	typedef BWindow CLASSNAME;

	BWindow()
	{
		Title("Adder");
		calc <<= THISBACK(Calc);
		close <<= THISBACK(Close);
	}
};