First attempt at implementing a CollectionTreeItemModel for a single model ( imaginatively enough, named SingleCollectionTreeItemModel ). I am using the ServiceCollection to test it, and have added a CollectionTreeView to the Jamendo service. Have also changed a few things around in the CollectionTreeView, but these should not impede normal usage (leaks a bit in the way I am using it at the moment though) Nothing really works yet, but it should not bother anyone who does not open the Jamendo service