code: function(count) {
          var cfgPageDate = DEF_CFG.PAGEDATE.key,
  
          prevDate = this.cfg.getProperty(cfgPageDate),
          newDate = DateMath.add(prevDate, DateMath.YEAR, count);
  
          this.cfg.setProperty(cfgPageDate, newDate);
          this.resetRenderers();
          this.changePageEvent.fire(prevDate, newDate);
      }
docs: Adds the designated number of years to the current calendar, and sets the current
  calendar page date to the new month.
  @method addYears
  @param {Number} count The number of years to add to the current calendar