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GridTableCellStyleInfo style = gridGroupingControl.TableControl.Model[row, col];
//get some record data
GridRecordRow grr = style.TableCellIdentity.Table.DisplayElements[row] as GridRecordRow;
DataRowView drv = grr.GetData() as DataRowView;
SInce a GridControl does not have a DataSource, I am not sure how any datarow is being mapped into the GridControl. If you are using a virtual grid and displaying data through the DataTable.DefaultView, then you can get the data through the DataView (or through the CurrencyManager). Maybe like this:
DataRowView drv = dataView1[row-1];
where dataView1 is the dataview you are using to provide the sorted data.