private void OnToggleInfo(object sender, RoutedEventArgs e)
 {
     //**********************************************************************************************
     // When Info button is pressed over call window.
     //**********************************************************************************************
     if (CallInfoToggled != null)
     {
         CallInfoToggled(BtnInfo.IsChecked ?? false);
     }
     if (_viewModel != null)
     {
         _viewModel.ToggleCallStatisticsInfo(BtnInfo.IsChecked ?? false);
     }
     SaveStates();
 }