void SettingsMenu(Bar& bar) {
		bar.Add("m meters", THISBACK(Setm));
		bar.Add("km kilometers", THISBACK(Setkm));
		bar.Add("ft feet", THISBACK(Setft));
		bar.Add("mi miles", THISBACK(Setmi));
		bar.Add("nmi naut mi", THISBACK(Setnmi));

	void SettingsMenu(Bar& bar) {
		bar.Add("m meters", THISBACK(Setm)).Check(true);

	void SettingsMenu(Bar& bar) {
		bar.Add("m meters", THISBACK(Setm)).Check(true);
		bar.Add("km kilometers"THISBACK(Setkm)).Check(true);
...
...

	void Setm() {
		Distm<<=revDistance(~Distance, un);
		un = 0;	
		Cfg[0] = "0";
		units<<="m";
		Distance<<=formatDistance(s, un, dp);
	}
	void Setkm() {
		Distm<<=revDistance(~Distance, un);
		un = 1;	
		Cfg[0] = "1";
		units<<="km";
		Distance<<=formatDistance(s, un, dp);
	}
	void Setft() {
		Distm<<=revDistance(~Distance, un);
		un = 2;	
		Cfg[0] = "2";
		units<<="ft";
		Distance<<=formatDistance(s, un, dp);
	}

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

class App : public TopWindow {
private:
	bool checkBox;
public:
	typedef App CLASSNAME;
	App();

	MenuBar menu;

	void MenuBar(Bar& bar);
	void FileBar(Bar& bar);

	void OnCheck();
};

App::App() : checkBox(false)
{
	Title("CheckBox test application");
	CenterScreen().Sizeable().MinimizeBox().MaximizeBox();
	SetRect(Size(320, 240));

	AddFrame(menu);
	AddFrame(TopSeparatorFrame());
	menu.Set(THISBACK(MenuBar));
}

void App::MenuBar(Bar& bar)
{
	bar.Add(t_("File"), THISBACK(FileBar));
}

void App::FileBar(Bar& bar)
{
	bar.Add(t_("Check"), THISBACK(OnCheck)).Check(checkBox).Key(K_CTRL_W);
	bar.Separator();
	bar.Add(t_("Exit"), THISBACK(Close)).Key(K_CTRL_Q);
}

void App::OnCheck()
{
	checkBox = !checkBox;
}

GUI_APP_MAIN
{
	App app;
	app.Run();
}