Plugin development for Thesis multimedia box

Does anyone know the correct reference to use so a plugin will work with shortcode in the multimedia box of the thesis theme?

I've already tried the thesis hook - thesis_hook_multimedia_box.
I've also tried hooking in the plugin itself and the custom_functions.php, but still no luck.
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DzynitAuthor Commented:
No, I tried that already, that works site-wide. I need to be able to use the page by page option of thesis to add video shortcode from a plugin per post or page.

I think the simplest thing would be to have the ability to just add the widget classname to the multimedia box, but have been unsuccessful at that so far. (I don't want to do core thesis edits that would be lost on upgrades.) If I were able to add that classname, all plugins would be compatible with the multimedia box.
DzynitAuthor Commented:
I needed something a little different than that article shows how to do, but this should still be in the knowledge base to help others find thesis theme help. For site-wide use of the media box, that articles is very helpful.
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