How to Get custom event on the property grid

public Timer _timer = new Timer();
        public event EventHandler TextChangedDelayed;
        //public event

        public DelayedText()
        {
            _timer.Interval = 1000;
            _timer.Tick +=new EventHandler(_timer_Tick);
        }

        private void _timer_Tick(object sender, EventArgs e)
        {
            _timer.Stop();
            onTextChangedDelayed();
        }
        protected override void OnTextChanged(EventArgs e)
        {
            base.OnTextChanged(e);
            _timer.Start();
            _timer.Stop();
        }

        protected virtual void onTextChangedDelayed()
        {
            if (TextChangedDelayed != null)
            {
                TextChangedDelayed(this, EventArgs.Empty);
            }
        }

        public int TextChangedDelayedInterval
        {
            get { return _timer.Interval;  }
            set { _timer.Interval = value; }

        }
    }