I know I've solved this issue before... but its been so long since I did it, I completely forgot how... I am registering a call in jQuery: Code: XenForo.register('.MultiMainer', 'XenForo.MultiMainer'); Using some different code, I inserted a div into my page using AJAX. That new code has a MultiMainer class included with it. However, that class is not getting registered for the callback, since its being called in through AJAX after initial page load. How do I make it so that new AJAX inserted elements get applied to the existing registers?