Behavior.php

public function beforeSave(Model $model, array $options = array()){
		
	var_dump($model->data['User']);
	//array (size=4)
	//	'id' => string '66' (length=2)
	//	'first_name' => string 'new first name' (length=14)
	//	'last_name' => string 'new last name' (length=13)
	//	'email' => string '[email protected]' (length=14)

	$x = $model->find('first', array('conditions' => array($model->alias  . '.' .$model->primaryKey => $model->id), 'contain' => 'User'));
	
	var_dump($x['User']);
	//array (size=10)
	//	'id' => string '66' (length=2)
	//	'first_name' => string 'new first name' (length=14)
	//	'last_name' => string 'new last name' (length=13)
	//	'email' => string '[email protected]' (length=14)
	//	'password' => string '*********************************' (length=40)
	//	'password_reset_key' => string '' (length=0)
	//	'password_reset_expiry' => string '0000-00-00 00:00:00' (length=19)
	//	'group_id' => string '2' (length=1)
	//	'created' => string '2012-12-03 15:15:18' (length=19)
	//	'updated' => string '2012-12-04 11:55:32' (length=19)

	die();
	return true;
}

Controller.php

var_dump($this->request->data['User']);

//output of var_dump().....
//array (size=4)
//	'id' => string '66' (length=2)
//	'first_name' => string 'new first name' (length=14)
//	'last_name' => string 'new last name' (length=13)
//	'email' => string '[email protected]' (length=14)

if ($this->Applicant->saveAssociated($this->request->data, array('deep' => true))) {
	$this->Session->setFlash(__('The applicant has been updated'), 'Flash/success');
	$this->redirect(array('action' => 'index'));
} else {
	$this->Session->setFlash(__('The applicant could not be updated Please, try again'), 'Flash/error');
}