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How do I set XBMC (running on pi) to automatically open an add-on on boot?

I'm currently building a Raspberry Pi powered Pandora Player running on XBMC and the Pandora add-on for a friend and I want this to go directly to Pandora add-on when it boots. I've been doing a TON of Google-ing to try and find an answer to my problem but I cant seem to find any documentation on how to do this for the pi. I have found plenty of articles for windows and other OS's. Help on how to go about this would be greatly appreciated. thanks alot.
     Harry