code: function() {
          var activated = OpenLayers.Strategy.prototype.activate.apply(this, arguments);
          if(activated) {
              this.layer.events.on({
                  "refresh": this.load,
                  scope: this
              });
              if(this.layer.visibility == true || this.preload) {
                  this.load();
              } else {
                  this.layer.events.on({
                      "visibilitychanged": this.load,
                      scope: this
                  });
              }
          }
          return activated;
      }
docs: Constructor: OpenLayers.Strategy.Fixed
  Create a new Fixed strategy.
  
  Parameters:
  options - {Object} Optional object whose properties will be set on the
  instance.
   
  Method: activate
  Activate the strategy: load data or add listener to load when visible
  
  Returns:
  {Boolean} True if the strategy was successfully activated or false if
  the strategy was already active.