/// <summary>
        /// Initializes a new instance of the <see cref="SetStartupProjectCommand"/> class.
        /// Adds our command handlers for menu (commands must exist in the command table file)
        /// </summary>
        /// <param name="package">Owner package, not null.</param>
        private SetStartupProjectCommand(VSPackage package)
        {
            if (package == null)
            {
                throw new ArgumentNullException("package");
            }

            this.package = package;

            OleMenuCommandService commandService = this.ServiceProvider.GetService(typeof(IMenuCommandService)) as OleMenuCommandService;

            if (commandService != null)
            {
                var menuCommandID = new CommandID(CommandSet, CommandId);
                var menuItem      = new OleMenuCommand(this.MenuItemCallback, menuCommandID);
                menuItem.BeforeQueryStatus += this.BeforeQueryStatus;
                commandService.AddCommand(menuItem);
            }
        }
 /// <summary>
 /// Initializes the singleton instance of the command.
 /// </summary>
 /// <param name="package">Owner package, not null.</param>
 public static void Initialize(VSPackage package)
 {
     Instance = new SetStartupProjectCommand(package);
 }