Rather than use a cable box I want to use my SageTV PVR system as a source. I have a SageTV HD-200 extender hooked up to my Slingbox 350 - the SageTV extender can receive LiveTV or anything recorded on the system such as RecordedTV, Ripped Movies, etc. The only problem is controlling it. When I set up my Slingbox it seems to only want to use Cable/Satellite STBs as a source. How can I have it use SageTV as the source so that it can send commands from the SageTV remote control? I don't mind having to learn commands if necessary.