public XLSheetViewContentManager(SheetView sheetView)
{
contents.Add(XLSheetViewContents.Pane, sheetView.Elements <Pane>().LastOrDefault());
contents.Add(XLSheetViewContents.Selection, sheetView.Elements <Selection>().LastOrDefault());
contents.Add(XLSheetViewContents.PivotSelection, sheetView.Elements <PivotSelection>().LastOrDefault());
contents.Add(XLSheetViewContents.ExtensionList, sheetView.Elements <ExtensionList>().LastOrDefault());
}