I want to assign the same text to one column of  all rows of the Grid

I have my custom grid and I added column like this:

    class Ailin_Orders_Block_Adminhtml_Sales_Order_Grid extends Mage_Adminhtml_Block_Widget_Grid
    {  //somecode
         protected function _prepareColumns()
            {
                $helper = Mage::helper('ailin_orders');
                $this->addColumn('Vendor Code',
                    array(
                        'header'=> Mage::helper('catalog')->__('Vendor Code'),
                        'width' => '50px',
                        'renderer'  => 'adminhtml/sales_render'
                ));
    }
    }

I created a file render.php to render the value simply like this:

    class Ailin_Orders_Block_Adminhtml_Sales_Render
    extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract
    {
        public function render(Varien_Object $row)
        {
            return "SCOZAH";
        }
    }
![enter image description here][1]


  [1]: https://i.sstatic.net/0qITD.png