code: function(month, fnRender) {
          for (var p=0;p<this.pages.length;++p) {
              var cal = this.pages[p];
              cal.addMonthRenderer(month, fnRender);
          }
      }
docs: Adds a month to the render stack. The function reference passed to this method will be executed
  when a date cell matches the month passed to this method.
  @method addMonthRenderer
  @param {Number} month  The month (1-12) to associate with this renderer
  @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.