code: function () {
              var possibleVals = result(this, 'possibleVals');
              var key;
              var i = 0;
              var possibleVal;
              var $checkbox;
              var isSelected;
              var $inputWrapper = this.getInputWrapper().empty();
  
              for (key in possibleVals) {
                  if (possibleVals.hasOwnProperty(key)) {
                      possibleVal = this._parsePossibleVal(possibleVals, key);
                      isSelected = this.isSelected(possibleVal.value);
                      $checkbox = this._renderInput(possibleVal, isSelected, i);
                      $inputWrapper.append($checkbox);
                      i++;
                  }
              }
              return this;
          }
docs: Renders the radio inputs and appends them to the input wrapper.
  @memberOf Backbone.fields.RadioListView#
  @return {Backbone.fields.RadioListView}