[fw-mvc] Zend_View could not auto loading Default_View_Helper_Test for Module Default.

I am learning Zend Framework . today I got a problem.
I try to wrote a View_Helper_Testing for my project Default Module.
My project Directory struts is like this :

application/
modules/
default/
controllers
scripts
helpers
account/
controllers
scripts
helpers
----------------------------------------
Zend Framework Could auto loading Account_View_Helper_Test for me from
/application/modules/account/helpers;
but it does not work loading Default_View_Helper_Test from
/application/modules/default/helpers.

here is my /application/modules/default/controllers/IndexController.php

<?php
class IndexController extends Zend_Controller_Action
{
public function indexAction()
{ var_dump($this -> view); }

}
and my /application/modules/account/controller/IndexController.php

<?php
class Account_IndexController extends Zend_Controller_Action
{
public function indexAction()
{ var_dump($this -> view); } }

}

and the View_Helper is simple:

<?php
class Default_View_Helper_Test extends Zend_View_Helper_Abstract
{
public function test()
{ return "testing"; }

}

----------------------------------------
I had reported this problem as a bug to Issue tracker.
http://framework.zend.com/issues/browse/ZF-10408
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