Adding nonvisual objects – PB Docs 2019

You can automatically create nonvisual objects in a window by
inserting a nonvisual object in the window. You do this if you want
the services of a nonvisual object available to your window. The
nonvisual object you insert can be a custom class or standard class
user object.

You insert a nonvisual object in a window in the same way you
insert one in a user object. For more information, see Using class user objects.