I would like to add a custom field to the Advanced Fields section in the Add Fields menu when creating/editing a form. How can I do this? Which hooks will I need to use? Is there any documentation relating to this?
I have searched the FAQs and Documentation, the only relevant result I found was http://www.gravityhelp.com/forums/topic/adding-a-custom-field, which was answered by an administrator, but the answer was not included in the thread.