title: ExtJs Dynamic Store Failed call Handle
body: <p>I have a clasic store </p>
  
  <pre><code>Ext.define('xxx.store.Search', {
      extend: 'Ext.data.Store',
      model: 'xxx.model.Search',
      requires: ['xxx.data.xxxx'],
      proxy:
              {
                  type: 'xxxxx',
                  digSearchUrl: {
                      initRequest: 'ajax/xxx/xxx/xx',
                      pollRequest: 'ajax/xxxx/xxxx/xxxxxx'
                  }
              },
      autoLoad: false,
      defaultSortDirection: 'DESC'
  });
  </code></pre>
  
  <p>Now i usually do a store load like this:  </p>
  
  <pre><code>   this.getStore('Search').load({
          digSearchCfg: {
              xxx: sid,
              xxx: xxxx
          }
      });
  </code></pre>
  
  <p>I know i could use the standard approch like in here: 
  <a href="https://stackoverflow.com/questions/13907860/attempting-to-load-ext-store-with-json-data-from-ajax-request-returns-error">Attempting to load Ext store with JSON data from AJAX request returns error</a>
  But i would rather define the error handler in the store it self. is that possible? </p>