code: function(evt) {
          var layers = this.layers;
          var feature;
          for(var i=0; i<layers.length; i++) {
              feature = layers[i].getFeatureFromEvent(evt);
              if(feature) {
                  return feature;
              }
          }
      }
docs: Method: getFeatureFromEvent
  walk through the layers to find the feature returned by the event
  
  Parameters:
  evt - {Object} event object with a feature property
  
  Returns:
  {<OpenLayers.Feature.Vector>}