title: Get value of clicked cell on grid
body: <p>I have been trying to get the value of clicked cell on grid. </p>
  
  <pre><code>cellDblClick: function(self, td, cellIndex, record, tr, rowIndex, e, eOpts)
  </code></pre>
  
  <p>I know I can get the record data, but I need the name of the column to get the value of the data.</p>
  
  <pre><code>record.data["name_of_column"]
  </code></pre>
  
  <p>What's the approach to get the value of clicked cell on grid?
  Is it possible to get the column name of clicked cell on grid?</p>
  
  <p>Can anyone shed the light for me?</p>
  
  <p>N.B. 
  I'm using extjs 4.2.1</p>