I managed to customize the New Form for my Content Types which inherit from Document Set as follows:
- put a copy of
15\TEMPLATE\LAYOUTS\MY\myNewDocSet.aspx. In this page, I played with SPUtility to hide and make read only fields and add some dynamic behaviour.
$contentType.NewFormUrl = "_layouts/MY/myNewDocSet.aspx".
I would like to do the same for the Edit Form of my content types, but don't know from which file to start.
Thank you for your insights, AllWorkNoPlay