static void OnHideSuggestion(object sender, EventArgs e)
        {
            HideTimer.Stop();

            if (_lastClicked != null)
            {
                _lastClicked.PrimarySuggestion.Text = string.Empty;
                _lastClicked = null;
            }
        }
        void Character_Button_Click(object sender, RoutedEventArgs e)
        {
            if (_lastClicked != null)
            {
                _lastClicked.PrimarySuggestion.Text = string.Empty;
            }
            _lastClicked = this;
            HideTimer.Stop();
            var interval = AppSettings.Instance.Prediction.KeyTopHintInterval;

            if (interval != 0)
            {
                HideTimer.Interval = TimeSpan.FromMilliseconds(interval);
                HideTimer.Start();
            }

            var vocal = (_state.IsChecked ? ShiftVocal ?? Vocal : Vocal) ?? Keytop;

            KeyboardHost.SendAlphanumericKeyPress(SendKeys, vocal);
        }