Forms - Readonly Select2field is not working

[yjad]

The example in the documentation to make "Readonly select fields" is not working. first it gives error because a parameter get_pk_func does not exist. After adding it as recommended in #xxx, the select2Field in the example is still selectable. Readonly StringField works fine

I am using latest flask-appbuilder, 4.7 and tested with python 13.11 and python 3.13.2