ok i think the problem is that i have to subclass index() too, because the treeview does request my additional row there. However, i do not know what to return - if i return an index from another item already existing in Qdirmodel, it adds that one, but if i return my own index created with createIndex, the program just crashes ... is there really no solution for this? i would consider this a very basic requirement but it just wont work