code: function(fnName, args) {
          var pageCount = this.cfg.getProperty(DEF_CFG.PAGES.key);
  
          for (var p=0;p<pageCount;++p) {
              var page = this.pages[p];
              if (page[fnName]) {
                  var fn = page[fnName];
                  fn.call(page, args);
              }
          } 
      }
docs: Calls a function within all child Calendars within this CalendarGroup.
  @method callChildFunction
  @param {String}  fnName  The name of the function
  @param {Array}  args  The arguments to pass to the function