code: function() {
          OpenLayers.Control.prototype.draw.apply(this, arguments);
          if (!this.gratLayer) {
              var gratStyle = new OpenLayers.Style({},{
                  rules: [new OpenLayers.Rule({'symbolizer':
                      {"Point":this.labelSymbolizer,
                       "Line":this.lineSymbolizer}
                  })]
              });
              this.gratLayer = new OpenLayers.Layer.Vector(this.layerName, {
                  styleMap: new OpenLayers.StyleMap({'default':gratStyle}),
                  visibility: this.visible,
                  displayInLayerSwitcher: this.displayInLayerSwitcher
              });
          }
          return this.div;
      }
docs: Method: draw
  
  initializes the graticule layer and does the initial update
  
  Returns:
  {DOMElement}