public override void Execute()
 {
     if (isCustomTone)
     {
         if (null != customTalkpointTone)
         {
             VSOperations.PlaySound(customTalkpointTone);
         }
     }
     else
     {
         VSOperations.PlaySound(talkpointTone);
     }
 }
 private void ToneSelectComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (!(sender is ComboBox))
     {
         return;
     }
     if ((sender as ComboBox).SelectedIndex < 0)
     {
         return;
     }
     if ((sender as ComboBox).SelectedItem is Tones tone)
     {
         VSOperations.PlaySound(tone);
     }
     else
     {
         VSOperations.PlaySound((sender as ComboBox).SelectedItem as CustomTone);
     }
 }