title: EXtjs 3.2 :How do I Set the specific cell as uneditable or read only?
body: <p>I am working with Extjs 3.2 ,my Editor grid consist of 5 column, 4 editable fields and 1 checkbox,</p>
  
  <p>The requirement is that when i uncheck the checkbox, the other four Cells of that row must become readonly.</p>
  
  <p>I am getting the Checked rowIndex ,columnIndex by using Cellclick event, but how do I select that Cell and set the property to Readonly/UnEditable. 
  I have tried using</p>
  
  <pre><code>    gridItems.setEditable(rowIndex, editable);
  
      gridItems[rowIndex].set('editable', true);
  </code></pre>
  
  <p>But it is not working.    </p>
  
  <p>I am really not getting the reason why this isn't working, do you have any ideas on what I could do differently?</p>