Cakephp find order by then group by

Hello In a Message controller I try to display the latest message of each user (sender) for a connected one (receiver)  I try this but I still find the first entry. Thank you for your help

Messages table:

• id
  
• user_id -> Sender
  
• receiver_id -> receiver
  
• content 
  
• created -> datetime
  
• statut -> read or not
  

$this->set('messages', $this->Message->find('all',
array(
'conditions' => array('Message.receiver_id'=>$user),
'order' => array('Message.created desc'),
'group'=>'Message.user_id')));

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