I’m glad to hear it worked. We are using many new and non-mainstream concepts for the User Interface: not sure if it looks like it but the user interface is the thing we’re spending most of the time on. Also consider that we’re using a new a pretty unexplored technology (Microsoft WPF) wich for the the first enables a developer to design an interface with animations, zoom and panning.
So, don’t get too shocked in finding out you’re very dependent on typical UI-elements as a scrollbar, so is anyone else and we’re aware of that.

Looking forward to help you with your list categories.

Andrea