template < class T >
class EnhancedEditField : public T
{
	public:
		typedef T BaseClass;
		EnhancedEditField() {};
		virtual ~EnhancedEditField() {};


		Callback whenFocusLost;
		
		virtual void LostFocus()
		{
			T::LostFocus();
			whenFocusLost();
		}
};

typedef EnhancedEditField<EditString> EnhancedEditString;
typedef EnhancedEditField<EditInt> EnhancedEditInt;
typedef EnhancedEditField<EditDouble> EnhancedEditDouble;

EditField.cpp :

void EditField::LostFocus()
{
	if(autoformat && IsEditable() && !IsNull(text)) {
		Value v = convert->Scan(text);
		if(!v.IsError()) {
			const Convert * cv = inactive_convert ? inactive_convert : convert;
			WString s = cv->Format(v);
			if(s != text) text = s;
		}
	}
	if(!keep_selection) {
		anchor = -1;
		cursor = sc = 0;
		WhenLostFocus();//<--here
	}
	Refresh();
	SyncEdge();
}

template <class T>
struct WithLostFocus : public T {
		Callback WhenLostFocus;
		
		virtual void LostFocus() {
			T::LostFocus();
			WhenFocusLost();
		}
};

template <class T>
struct WithLostFocus : public T {
		Callback WhenLostFocus;
		
		virtual void LostFocus() {
			T::LostFocus();
			WhenLostFocus();
		}
};