cakephp access through models

cakephp access through models

I try to code a order system and it is my first cake project.
i have a order, a user and a useraddress.
//Order model
public $belongsTo = array(
'User' => array(
'className' => 'User'
));
//User model
public $hasOne = array(
'Useradr' => array(
'className' => 'Useradr',
'foreignKey' => 'user_id',
'order' => ''
)
);
//maybe not necessary Useradr model
public $belongsTo = 'User';
Now i want to access the useraddress while i add/edit a voucher.
I can access the User in the voucher edit view:
echo $this->Form->input('User.email',array(
'label' => 'Email',
));
But not the Useraddress. What iam doing wrong ?
Thank you very much!
Julius