How can add a new menu item underneath the "insert From URL" on the left sidebar in the new Wordpress 3.5 Media Manager?
I've been looking at the backbone js and tried my hand at hooking into it with my own JS but without success.
Edit 2: This seems to do the trick:
http://sumtips.com/2012/12/add-remove-tab-wordpress-3-5-media-upload-page.html
It should do for simple stuff, but I guess its also possible to do the same thing in Javascript. Would be nice if there was a tutorial/explanation on how the new media manager internals work.