code: function(name, graphType){
      Flotr.graphTypes[name] = graphType;
      Flotr.defaultOptions[name] = graphType.options || {};
      Flotr.defaultOptions.defaultType = Flotr.defaultOptions.defaultType || name;
    }
docs: Can be used to add your own chart type.
  @param {String} name - Type of chart, like 'pies', 'bars' etc.
  @param {String} graphType - The object containing the basic drawing functions (draw, etc)