class Gun : public WithGunLayout<TopWindow> {	
....
public:
....	
	Gun() {
		mj.Init(this);
	}
	Kep_lay mj;
	void RightMouseHandler(Point p, dword keyFlags) {
		// Do it.
	}
....
};

class Kep_lay : public Withkep_lay<StaticRect> {
public:
	typedef Kep_lay CLASSNAME;

	void Init(Gun *_parent) {parent = _parent;}
	virtual void RightDown(Point p, dword keyFlags) {
		parent->RightMouseHandler(p, keyFlags);
private:
	Gun *parent;
};