Override schema() method for _assoc because _assoc is a widget.  It must refer to its host form's schema.
Override schema() method for _assoc because _assoc is a widget.  It must refer to its host form's schema.

cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw,cjungmann/schemafw