public static ToolStripMenuItem BindCommand(this ToolStripDropDown dropDown, CommandManager commandManager, string commandId, object argument)
        {
            Lifetime<ICommand> command = commandManager.FindCommand(commandId);
            if (command == null)
                throw new ArgumentException();

            return dropDown.BindCommand(command, argument);
        }
 public static ToolStripMenuItem BindCommand(this ToolStripDropDown dropDown, CommandManager commandManager, string commandId)
 {
     return dropDown.BindCommand(commandManager, commandId, (object)null);
 }