title: Selectively aborting an ajax request sent via Extjs Direct proxy
body: <p>I have a store which is loaded w.r.t items from a list  using Extjs direct proxy. </p>
  
  <pre><code>   proxy : {
                  type: 'direct',
                  api: {
                      read: bomManagementAction.bomQuickDetails
                  }                      
                }
  </code></pre>
  
  <p>and the response is displayed in a grid panel.<br>
       If larger number of items are selected, it will take long time to complete , so if a longer request is pending and if we sent a short request , definitely the grid will be updated with the latter one , but what happens is when the former request completes then the grid will re update with the former one which is non desirable. I came to know that the '<strong><code>autoabort</code></strong>' config is present in '<strong><code>Ext.data.Connection</code></strong>' class but not in proxy.direct ...<br> please help</p>