Which export format you are using? Keep in mind that you need either to rebind the grid or enable IgnorePaging
in order to collapse the detail tables. Another possible solution is to hide the NestedViewTemplate when you export the grid. Please check out the following help article.
sender, GridItemEventArgs e)
GridNestedViewItem && RadGrid1.IsExporting)
Similarly You should rebind the grid or enable IgnorePaging.
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