@Kaape
You say you're using J3, in that case you'll probably need an altered attachment-script this as the Mootools-version has been changed.
--> Will upload the adjusted one, this weekend.
//
Am thinking of adapting the events+settings backend-view for J3+, so you (and other people) have an example of how to alter the views to make it more compatible with J3+. Can be done within 2/3 weeks.
But be aware: Not all the views in the back have been altered to make use of JForm and are a bit harder to style, but nevertheless it can be done.