code: function(sDates, fnRender) {
          for (var p=0;p<this.pages.length;++p) {
              var cal = this.pages[p];
              cal.addRenderer(sDates, fnRender);
          }
      }
docs: Adds a renderer to the render stack. The function reference passed to this method will be executed
  when a date cell matches the conditions specified in the date string for this renderer.
  @method addRenderer
  @param {String} sDates  A date string to associate with the specified renderer. Valid formats
  include date (12/24/2005), month/day (12/24), and range (12/1/2004-1/1/2005)
  @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.