Trouble overriding default Flask-Security Forms

[NickWoodhams]

Hey Matt,

Having trouble overriding the default registration form for Flask-Security.

Edited these lines in factory.py

security.init_app(app, SQLAlchemyUserDatastore(db, User, Role),
    register_form=ExtendedRegisterForm,
    register_blueprint=register_security_blueprint)

Any thoughts on why the Extended form might not be showing up?