title: Magento how to call Parent's parent function?
body: <p>I have overridden the class <code>Mage_Adminhtml_Block_Sales_Order_Grid</code> . This class is extended from <code>Mage_Adminhtml_Block_Widget_Grid</code>. And I want to call the <code>_prepareCollection()</code> of <code>Mage_Adminhtml_Block_Widget_Grid</code> function inside my class. How can I do this? I have tried with <code>parent::_prepareCollection();</code>. But it loads the immediate parent's method. But I want to call parent's parent class functions. Any suggestions please?</p>
  
  <p>my class is as follows.</p>
  
  <pre><code>class Test_ExtendedGrid_Block_Sales_Order_Grid extends Mage_Adminhtml_Block_Sales_Order_Grid
  {
      // some code
  }
  </code></pre>