code: function _fillInputRadio(name, value, next) {
          this.element({
              value: "//input[@name='"+escapeString(name, "'")+"' and @value='"+escapeString(value, "'")+"']",
              strategy: "xpath"
              }, function (el) {
                  el.click(next);
              });
      }
docs: retrieve the radio button qith value and click on it