What I can suggest you would be to subscribe to the PrepareDescriptionForField
event of the DataSourceProvider and set the SortOrder of the new Description to None in the event handler the following way:
sender, PrepareDescriptionForFieldEventArgs e)
(e.DescriptionType == DataProviderDescriptionType.Group)
PropertyGroupDescriptionBase).SortOrder = SortOrder.None;
Hope this helps.
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