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Yesterday, I was trying to write a custom hierarchical cursor class that implements the IHierarchicalCollectionViewCursor interface. But no matter what I tried, the AdvancedDataGrid would not recognise my implemented cursor class as being hierarchical. When I extended the HierarchicalCollectionViewCursor class, the AdvancedDataGrid would happily recognise it - even I overrode every single method and property... yet, as soon as I switched the class to implement IHierarchicalCollectionViewCursor instead of extending HierarchicalCollectionViewCursor the AdvancedDataGrid would break again.