public NameXPtg GetNameXPtg(String name)
 {
     return(_iBook.GetNameXPtg(name, _uBook.GetUDFFinder()));
 }
        public Ptg GetNameXPtg(string name, SheetIdentifier sheet)
        {
            int sheetRefIndex = GetSheetExtIx(sheet);

            return(_iBook.GetNameXPtg(name, sheetRefIndex, _uBook.GetUDFFinder()));
        }