Big problem with using Model 1.3

Hi everyone.
I have a big problem. I create model and controller:

class GroupController extends AppController {
var $name = 'Group';
var $uses = array('Groups');
var $components = array('Session', 'Auth');

class Groups extends AppModel {
var $name = 'Groups';
var $useTable = 'groups';
var $primaryKey = 'id_group';

When I use:

$user = $this->Group->find('all');

I see this error:
Undefined property: GroupController::$Groups [APP/controllers/
group_controller.php, line 30]

Fatal error: Call to a member function find() on a non-object in /home/
public_html/simple/app/controllers/group_controller.php on line 30

I know that I can use
$this->loadModel('Groups');
$groups = $this->Groups->find('all');
this work but I need associations in future. I don't know what is
going on. I use 1.3.6.

Sorry for my English.
Thanks for help

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