public string this[TagDescription desc]
 {
     get
     {
         string unformated = this[desc.Fullname];
         return(desc.FormatMethod(unformated));
     }
 }
        private static void addToDictionary(TagGroupDescription group, int key, string name, string description, Type datatype, FormatMethod formatMethod)
        {
            TagDescription td = new TagDescription(group, name, description, datatype, key, formatMethod);

            Tags.Add(td.Fullname, td);
        }