I believe that you can use Catel's service or just implement your own and replace in ServiceLocator. Can you give me some pointers? For example I/we could improve the example provided "FilterBox" so that it uses a non-default AutoCompletion Service (that kind of example would be more helpful to newcomers to the orc controls that the simple example provided now - I mean this positively). Is there somewhere else I could look for examples? Thanks.