void ShowUpdateWindow(object param)
        {
            var updatableParticipant = GetSelectedProgressViewModel(SelectedParticipant.Id);

            _updateWindow         = new ParticipantUpdateView(updatableParticipant);
            _updateWindow.Closed += OnUpdateWindow_Closed;
            _updateWindow.Show();
        }
 void OnUpdateWindow_Closed(object sender, EventArgs e)
 {
     _updateWindow.Closed -= OnUpdateWindow_Closed;
     _updateWindow         = null;
 }