Hey Bao,
thanks, you’re right, the “on()” method would be a much better solution here.
Regarding the fancybox overlays: for the record the code for the fancybox is contained in the /includes/fancybox/ folder; what needed to be done is to insert the same function that is generated by the fancybox files as a callback for the Isotope’s “appended” method (see last instance of .isotope in the “header-functions.php” file).
Best,
Andrew / Satori Studio