validate select field in a Model

[Chris]

hi guys,... I'm using cake 1.3 
how can I validate "select" field from Model,....? 

what I have in bootstrap: 
 Configure::write('User.genders', array('unknown', 'male', 'female'));

in a view: 
     <tr>
        <td><strong><?php echo ucfirst(__('gender', true)) ?></strong>
<?php 
$genders = array(Configure::read('User.genders')); 
echo $this->Form->select('gender', $genders) 
?>
</td>
     </tr>

and in a Model: 
  var $validate = array(
     'gender' => array(
      'rule' => 'notEmpty',
      'required' => true,
      'message' => 'Gender must be valid',
     ),
  );

I'm not getting warning of red box with "Gender must be valid" 

how can I do this....? 

thanks in advance 
chris 

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