public void ConfigureMenu(IMainMenu menu)
{
menu.AddCommandChild(TopMenuKey.File, ExMenuKey.FileNew, "_New");
MenuSeed <ExMenuKey> seed = new MenuSeed <ExMenuKey>(ExMenuKey.FileDemoKey, "Demo");
seed.ParentKey = TopMenuKey.File;
seed.ShortcutKey = Key.D; seed.ShortcutModifier = ModifierKeys.Control;
seed.Tooltip = "Uses keyboard shortcut to invoke something.";
menu.AddCommand(seed);
menu.AddCommandChild(TopMenuKey.Option, ExMenuKey.OptionFlag, "_Flag");
ButtonBus <ExMenuKey> .AddExclusiveCommands(menu, ExMenuKey.OptionFlag,
new[] { ExMenuKey.OptionFlagAustria, ExMenuKey.OptionFlagBulg, ExMenuKey.OptionFlagNed });
}