public Ref3DPtg(String cellref, int externIdx ) {this(new CellReference(cellref), externIdx);}
public Ref3DPtg(String cellref, int externIdx){CellReference c = new CellReference(cellref);Row=c.Row;Column=c.Col;IsColRelative=!c.IsColAbsolute;IsRowRelative=!c.IsRowAbsolute;ExternSheetIndex=externIdx;}