Form Builder Configuration: How To Include Other Config Files?

I may have missed the nuances of the tutorials/documentation, so I am posting here as a last result. (Using version 1.1.12.)

I have a number of small form builder configuration files intended to render frequently reused forms. I would like to combine these into a larger form. So let’s say we have a registration form that includes a user form and other nested forms configured from other files… how is that done?

I’ve tried this configuration in the registration file:




return array(

    'elements' => array(

	'userForm' => array(

	    'type' => 'form',

	),

	'passwordForm' => array(

	    'type' => 'form',

	),

	'profileForm' => array(

	    'type' => 'form',

	),

    ),

    'buttons' => array(

	'submit' => array(

	    'type' => 'submit',

	    'label' => 'Submit',

	),

	'cancel' => array(

	    'type' => 'button',

	    'label' => 'Cancel',

	),

    ),

);



and here’s a look at the userForm configuration file:




return array(

    'elements' => array(

	'email' => array(

	    'type' => 'text',

	    'maxlength' => 48,

	),

	'cellPhoneNo' => array(

	    'type' => 'text',

	    'maxlength' => 14,

	),

    ),

);



Here’s the code from the controller tying it all together:




[...]

	$form = new CForm('application.views.registration.registerForm');

	$userForm = new CForm('application.views.user._form');

	$profileForm = new CForm('application.views.userProfile._form');

	$passwordForm = new CForm('application.views.password._registerForm');


	$userForm->model = new User;

	$profileForm->model = new UserProfile;

	$passwordForm->model = new PasswordForm;


	$form['userForm'] = $userForm;

	$form['profileForm'] = $profileForm;

	$form['passwordForm'] = $passwordForm;


[...]

	$this->render('register', array('form'=>$form));

    }



This looks like it should work but an exception is thrown in the ‘render’ statement. I’m obviously doing something wrong… suggestions?