Magento管理网格添加编辑页面显示空白页面

Question

我是magento的新手并尝试使用admin grid.admin网格工作正常，但添加和编辑页面显示空白页面。 我的代码中是否有任何问题。

来自控制器的行动。

<footer>

从块

编辑信息

public function editAction()
  {

       $testId = $this->getRequest()->getParam('info_id');
       $testModel = Mage::getModel('test/info')->load($testId);
       if ($testModel->getInfoId() || $testId == 0)
       {

         Mage::register('test_data', $testModel);
         $this->loadLayout();
         $this->_setActiveMenu('test/info_book');
         $this->_addBreadcrumb('test Manager', 'test Manager');
         $this->_addBreadcrumb('Test Description', 'Test Description');

         $this->getLayout()->getBlock('head')
              ->setCanLoadExtJs(true);
         $this->_addContent($this->getLayout()
              ->createBlock('test/adminhtml_info_edit'))
              ->_addLeft($this->getLayout()
              ->createBlock('test/adminhtml_info_edit_tabs')
          );                     

          var_dump($this->getLayout()->getUpdate()->getHandles());             
         $this->renderLayout();            

       }
       else
       {
             Mage::getSingleton('adminhtml/session')
                   ->addError('Test does not exist');
           $this->_redirect('*/*/');
        }


   }

来自

的信息编辑

class Demo_Test_Block_Adminhtml_Info_Edit extends
                Mage_Adminhtml_Block_Widget_Form_Container{
public function __construct()
{   
    parent::__construct();

    $this->_objectId = 'id';       
    $this->_blockGroup = 'test';        
    $this->_controller = 'adminhtml_info';        
    $this->_updateButton('save', 'label','save reference');
    $this->_updateButton('delete', 'label', 'delete reference');
}

public function getHeaderText()
{
     return 'Add a contact';
}
}

conf文件

class Demo_Test_Block_Adminhtml_Info_Edit_Form extends
                      Mage_Adminhtml_Block_Widget_Form
{
  protected function _prepareForm()
  {

     $form = new Varien_Data_Form(
            array(
              'id' => 'edit_form',
              'action' => $this->getUrl('*/*/save', array('info_id' => $this->getRequest()->getParam('info_id'))
                 ),
             'method' => 'post',
             )
          );
    $form->setUseContainer(true);
    $this->setForm($form);
    return parent::_prepareForm();

  }
  }