code: function() {
      var allOptions = this.dropdown.options,
          i=0, j=allOptions.length;
  
      // Look for multi-select selections
      if(lang.isArray(this.value)) {
          var allValues = this.value,
              m=0, n=allValues.length,
              hash = {};
          // Reset all selections and stash options in a value hash
          for(; i<j; i++) {
              allOptions[i].selected = false;
              hash[allOptions[i].value] = allOptions[i];
          }
          for(; m<n; m++) {
              if(hash[allValues[m]]) {
                  hash[allValues[m]].selected = true;
              }
          }
      }
      // Only need to look for a single selection
      else {
          for(; i<j; i++) {
              if(this.value === allOptions[i].value) {
                  allOptions[i].selected = true;
              }
          }
      }
  }
docs: Resets DropdownCellEditor UI to initial state.
  
  @method resetForm