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Gets the collection of GroupDescriptor objects used to organize the loaded entities into groups.
public GroupDescriptorCollection GroupDescriptors { get; }
Grouping only works in WPF and Silverlight. It is ignored in WinForms because WinForms data binding does not support grouping.
When a GroupDescriptor is applied, the data will inherently be sorted by the grouped property. To force a grouped property to be sorted in descending order, add a SortDescriptor to the SortDescriptors collection for that property using the Descending direction.