code: function() {
          if (OpenLayers.Control.prototype.activate.apply(this, arguments)) {
              this.map.events.register('mousemove', this, this.redraw);
              this.map.events.register('mouseout', this, this.reset);
              this.redraw();
              return true;
          } else {
              return false;
          }
      }
docs: APIMethod: activate