title: ExtJs 4.0.7, how to use eOpts in events?
body: <p>I am writing this:</p>
  
  <pre><code>var idOptionsModel = getOptionsModel(opciones, fldId);
  var idOptionsStore = getStore(idOptionsModel, idOptionsModel);
  var dependsOn = record.get('dependeDe');
  var hasDependency = (typeof dependsOn == 'string');
  if( hasDependency ) {
    idOptionsStore.on('beforeload', function( store, operation, eOpts ) {
  
    });
  }
  </code></pre>
  
  <p>Well in this point I have a doubt on how to pass parameters to eOpts, if the event is fired automatically.</p>
  
  <p>What I need to do is override the <code>proxy.url</code> property in order to add a parameter in the url, which is the <code>father</code> combobox (Selecting Country->State->City).</p>
  
  <p>Thanks!!</p>