VLDSFromSourceFilter Howto

[Claudio]

I hate to bump, but a lot of views and no one answer ?_?

Please, someone could tell me how do I gain access to interface of Datastead's RTSP source filter (or any other one, for that matter) ?
I am only a step behind to make a demo and buy copies of Videolab, but for the life of me I cannot figure how to reach the Load(url, null) filter call through the component.

Please, help...