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gridAlarmDetails.Binder.InternalColumns[Index].StyleInfo.CellValue = false;
try this code:
gridAlarmDetails.Model.ColStyles[Index + 1].CellValue = false;
The grid gets it default column values from the values in ColStyles.
If this does not work, then try setting the DataColumn.DefaultValue for each of these columns in the DataTable. (Set these DefaultValues before you add any rows to the Datatable.)
this.gridControl1.ControllerOptions = GridControllerOptions.All & (~GridControllerOptions.OleDataSource);