We are looking to create custom Controls for business specific fields. I wanted to see if you could point out which Java library files would encapsulate the Typed Controls or adding a new section to the controls menus.
This is done using XBL, which is a large topic. It doesn't use Java; it
make it work with Orbeon Forms. You can find documentation about this on the
page below, on the pages linked from there. And of course, just let us know
if you have any question or stumble upon any problem.