private void OnClosing(object sender, CancelEventArgs e)
        {
            if (_mainWindowCoordinator.Saved)
            {
                return;
            }

            if (_coordinator.ShowModalMessageWindow(_localizer.CommonWarnig, _localizer.MainWindowCloseWarning) == false)
            {
                e.Cancel = true;
                return;
            }

            if (!_workspace.ProjectFile.IsEmpty)
            {
                _workspace.ProjectFile.Operator.Tell(ForceSave.Seal(_workspace.ProjectFile), ActorRefs.NoSender);
            }
        }