By using NumberedRowHeaders property:
You can number the row headers in the GridGroupingControl by enabling the NumberedRowHeaders property. This property supports only the Header cell type. As the row header of the GridGroupingControl is ColumnHeaderCell cell type, the cell type should be changed to Header to number the row headers. The following code example demonstrates the same.
By using PrepareViewStyleInfo Event:
Row headers can also be numbered through the PrepareViewStyleInfo event.
The following image shows the GridGroupingControl with numbered row headers.
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