void ThreadCreated(object sender, System.ComponentModel.PropertyChangedEventArgs e)
 {
     try
     {
         _thread.PropertyChanged -= ThreadCreated;
         _c = _thread.GetComment(_comment);
         ShowComment(_c);
         ProgressBar.Visibility       = Visibility.Collapsed;
         CompositionTarget.Rendering += UpdateViewer;
     }
     catch (Exception)
     {
     }
 }