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Update custom grid on the product when close the window

Update custom grid on the product when close the window

Hello, I create a tab on the product, on tab there have a grid and a button, where add a data on the grid. but the button used the popup window, on the popup have 3 select data. I want when I click the button ok, there update the grid with the new info. I use this code:
 Windows.close('widget_window');

                    new Ajax.Request(answerUrl, {
                            method: 'post',
                            onComplete: function(response) {
                                alert(response.responseText);
                                
                                $('makelistGrid').update(response.responseText);
                            }
                        });

 

and the controllerproduct.php
 public function customAction()
    {
        $this->_initProduct();
        $this->loadLayout();
        $this->getLayout()->getBlock('catalog.product.edit.tab.custom')
             ->setProductsCustom($this->getRequest()->getPost('products_custom', null));
        $this->renderLayout();
    }

but when there update the grid there show me no have info.
How can show me the update?