gistfile1.cs

        private bool _stillDown;
        public bool stillDown
        {
            get { return _stillDown; }
            set { _stillDown = value; NotifyOfPropertyChange(() => stillDown);
                if (resolved == _stillDown) resolved = !_stillDown;
            }
        }

        private bool _resolved;
        public bool resolved
        {
            get { return _resolved; }
            set { _resolved = value; NotifyOfPropertyChange(() => resolved);
                if (_resolved == stillDown) stillDown = !_resolved;
            }
        }