I'm creating a new add-on and I can't get Listener.php to echo a test string. I expect the word "test" to be echo'ed when I view a thread with attachments. The file I'm trying to extend is: /library/Xenforo/ViewPublic/Attachment/View.php When I create a new Code Event Listener, should I listen to load_class or load_class_view ?? Thank you for your help.