code: function(find) {
          var selected = -1,
              seldates = this.cfg.getProperty(DEF_CFG.SELECTED.key);
      
          for (var s=0;s<seldates.length;++s) {
              var sArray = seldates[s];
              if (find[0]==sArray[0]&&find[1]==sArray[1]&&find[2]==sArray[2]) {
                  selected = s;
                  break;
              }
          }
      
          return selected;
      }
docs: Gets the index of a date field array [yyyy,mm,dd] in the current list of selected dates.
  @method _indexOfSelectedFieldArray
  @private
  @param {Number[]}  find The date field array to search for
  @return {Number}   The index of the date field array within the collection of selected dates.
  -1 will be returned if the date is not found.