docs: function(option) {
              // ignore if it's already selected
              if (option === this.selected) {
                  return;
              }
  
              if (this.dom.ul) {
                  if (this.selected !== -1) {
                      this.dom.options[this.selected].className = '';
                  }
  
                  this._addSelectedOptionClass(option);
              }
  
              this.selected = option;
  
              // set the button text to the selected option
              this.setBtnText($(this.options[option].label).text());
  
              this.base(option);
          }