public ProjectItem AddFolder(string Name, string Kind = "{6BB5F8EF-4483-11D3-8BCF-00C04F8EC28C}")
        {
            var projectItem = new ProjectItemDouble(Name);

            _projectItems.Add(projectItem);
            return(projectItem);
        }
        public ProjectItem AddFromFile(string FileName)
        {
            var projectItem = new ProjectItemDouble(FileName);

            _projectItems.Add(projectItem);
            return(projectItem);
        }