Me.grdStatusHistory.Model.ColStyles(Me.grdStatusHistory.Binder.NameToColIndex("dDateChanges")).CellValueType = GetType(DateTime)
grdStatusHistory.Binder.InternalColumns("dDateChanges").StyleInfo.CellValueType = GetType(DateTime)
Me.grdStatusHistory.Binder.InternalColumns("dDateChanges").StyleInfo.Format = "dd-MMM-yyyy hh:mm"
If you have explicitly added GridBoundColumns, then you use the grdStatusHistory.GridBoundColumns collection set the styles on the columns.