Hello Axel Blasco,
RadTreeListView is a possible option only when homogeneous data is concerned. For heterogeneous data scenarios I would advise you to use a hierarchical RadGridView.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items