public NavMenu AddSubMenu(string _id, string _name, string _url, string _target)
        {
            NavMenu subMenu = new NavMenu();

            subMenu.Id     = _id;
            subMenu.Name   = _name;
            subMenu.NavUrl = _url;
            subMenu.Target = _target;
            return(AddSubMenu(subMenu));
        }
 public NavMenu AddSubMenu(NavMenu subMenu)
 {
     subMenu.ParentMenu = this;
     subMenus.Add(subMenu);
     return(subMenu);
 }