Gets a collection of GroupDescription objects that defines how to group the items.
Assembly: PresentationFramework (in PresentationFramework.dll)
Property ValueType: System.Collections.ObjectModel.ObservableCollection<GroupDescription>
An ObservableCollection<T> of GroupDescription objects. The collection is indexed by the group levels.
This property can be set only by accessing the collection object and using its various methods, such as Add. The property to access the collection object is read-only, while the collection itself is read-write.