validate select field in a Model

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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