void Menu(Bar& bar)
{
	//auto num_ok = [&](bool b){ numbers_enabled = b; };
	//std::function<void(bool)> num_ok = [&](bool b){ numbers_enabled = b; };

	//bar.Add("Enable numbers", [=] { numbers_enabled = !numbers_enabled; }) //--orig code
	//bar.Add("Enable numbers", THISBACK1(num_ok, !numbers_enabled) ) //fail 
	//bar.Add("Enable numbers", Callback1<bool>(num_ok, !numbers_enabled) ) //fail
	   .Check(numbers_enabled);

	bar.Add(numbers_enabled, "Numbers", THISBACK(SubMenu));
	bar.Add("Exit", [=] { Exit(); })
	   .Key(K_CTRL_E);
}