title: Mass action doesn't work for Magento backend grid serializer
body: <p>I've created a grid inside the tab using grid serializer using <a href="http://excellencemagentoblog.com/blog/2011/09/07/magento-grid-serializer-admin-tabs-grid/" rel="nofollow">this tutorial</a>. Then I've added a massaction to this grid using <a href="http://inchoo.net/magento/how-to-add-massactions-to-magentos-grid/" rel="nofollow">this tutorial</a>. </p>
  
  <p>Mass action block has appeared, but when I choose entities, choose massaction and click Submit, following error has been thrown to browser's console:</p>
  
  <pre><code>"ReferenceError: {gridId}_massactionJsObject is not defined"
  </code></pre>
  
  <p>Have anybody ever tried to add a mass action to the grid inside the tab? How to solve this error?</p>