code: function (p_bDisabled) {
          
              var nButtons = this.getCount(),
                  i;
          
              if (nButtons > 0) {
          
                  i = nButtons - 1;
                  
                  do {
          
                      this._buttons[i].set("disabled", p_bDisabled);
                  
                  }
                  while (i--);
          
              }
          
          }
docs: Protected attribute setter methods 
  @method _setDisabled
  @description Sets the value of the button groups's
  "disabled" attribute.
  @protected
  @param {Boolean} p_bDisabled Boolean indicating the value for
  the button group's "disabled" attribute.