Signum.Windows.AutocompleteTextBox.Suggest C# (CSharp) Метод

        private void Suggest()
        {
            if (txtBox.Text.Length < MinTypedCharacters)
            {
                pop.IsOpen = false;
                lstBox.ItemsSource = null;
                return;
            }

            var s = source;

            if (s != null)
                s.Cancel();

            delayTimer.Start(); 
        }