title: How can we add auto incremented column in gridpanel ext js 4.2
body: <p>In grid Panel i want to show auto incremented row with column Id how can i achieve this?
  e.g: </p>
  
  <pre><code>    ID     Name    Age
      1       A      52 
      2       B      25  
      3       C      20 
      4       D      20
      5       E      30 
  </code></pre>
  
  <p>and if we delete record ID no. 3 then increment value will be changed too.</p>
  
  <pre><code>    ID     Name    Age
      1       A      52 
      2       B      25  
      3       D      20
      4       E      30 
  </code></pre>
  
  <p>with regards 
  vik</p>