Just make sure that button is there, as of the patch this wednesday you right click on the spell book button to bring up the spell favorites menu. Imagine on a lot of UI's where this button isn't there, there will be a scramble to bring it in to return this functionality.

This thread is now....closed!

The beta has been release for public review!

http://www.eqgui.com/showthread.php?s=&postid=46112

Thanks!