/**
  * Renders grid column
  *
  * @param   Varien_Object $row
  * @return  string
  */
 public function render(Varien_Object $row)
 {
     $fileExists = $row->getConfigFileExists();
     if ($fileExists == "false") {
         return "<p class='error'>" . Mage::helper('modulesmanager')->__('%s does not exist', $row->getConfigFilePath()) . "</p>";
     } else {
         return "<p class='pass'>" . $fileExists . "</p>";
     }
 }