gistfile1.php

<?php
App::uses('AppController', 'Controller');
/**
 * Helps Controller
 *
 * @property Help $Help
 * @property PaginatorComponent $Paginator
 */
class StatesController extends AppController {
    var $helpers = array('Html','Js');
    
    public function get_states() {
        
       $country_id = $this->request->data['State']['country_id'];
       
		$states = $this->State->find('list', array(
			'conditions' => array('State.country_id' => $country_id),
			'recursive' => -1
			));    
                $countries = $this->State->Country->find('list');
		$this->set(compact('states','countries'));
		    
        
               
    }
}



<div class="users form">
<?php echo $this->Form->create('State');?>
	<fieldset>
		<legend><?php echo __('Add User'); ?></legend>
                
	<?php
		echo $this->Form->input('country_id',array('empty' => 'Choose Country')); 
                
        ?>
                
		
	
	</fieldset>
<?php echo $this->Form->end(__('Submit'));?>
</div>