/**
  * Renders grid column
  *
  * @param   Varien_Object $row
  * @return  string
  */
 public function render(Varien_Object $row)
 {
     $warehouse_id = Mage::app()->getRequest()->getParam('id');
     if (!$warehouse_id) {
         $warehouse_id = 0;
     }
     $product_id = $row->getEntityId();
     $allocated_qty = $row->getAllocated();
     $url = Mage::helper('adminhtml')->getUrl('inventoryadmin/adminhtml_stock/customerchart');
     if ($row->getAllocated()) {
         return '<p style="text-align:center"><a name="url" href="javascript:void(0)" onclick="showcustomer(' . $product_id . ',' . $warehouse_id . ')">' . $allocated_qty . '</a></p>';
     } else {
         return '0';
     }
 }