Hierarchy radgrid ExportToExcel()

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C#

MS-Excel

Telerik

export

radgrid

Hi everyone,
I'm trying to export Hierarchy radgrid to excel:

if (Grid != null)
            {
                reportGrid.ExportSettings.ExportOnlyData = true;
                reportGrid.ExportSettings.IgnorePaging = true;
                reportGrid.ExportSettings.OpenInNewWindow = true;
                reportGrid.MasterTableView.ExportToExcel();
            }

but it does not do the export.
Do you have any idea?

thank you!