code: function (p_nKeyCode) {
          
              var sType = this.get("type"),
                  aKeyCodes = (sType == "checkbox" || sType == "radio") ? 
                      this.CHECK_ACTIVATION_KEYS : this.ACTIVATION_KEYS,
          
                  nKeyCodes = aKeyCodes.length,
                  bReturnVal = false,
                  i;
          
  
              if (nKeyCodes > 0) {
          
                  i = nKeyCodes - 1;
          
                  do {
          
                      if (p_nKeyCode == aKeyCodes[i]) {
          
                          bReturnVal = true;
                          break;
          
                      }
          
                  }
                  while (i--);
              
              }
              
              return bReturnVal;
          
          }
docs: Protected methods 
  @method _isActivationKey
  @description Determines if the specified keycode is one that toggles
  the button's "active" state.
  @protected
  @param {Number} p_nKeyCode Number representing the keycode to
  be evaluated.
  @return {Boolean}