如何处理弹出窗口包装窗口的关闭事件？

Question

我通过弹出窗口向用户显示一些内容。弹出窗口的视图模型有一个＆＃34; CloseWindowCommand＆＃34;它的方法如下;

    private void CloseWindow()
    {
        var codeFileViewModels = CodeFileViews.Select(view => GetCodeFileViewModel(view)).Where(viewModel => viewModel.IsDirty);
        foreach (var codeFileViewModel in codeFileViewModels)
        {
            _regionManager.RequestNavigate(
                WellKnownRegionNames.CodeFileRegion,
                new Uri(WellKnownViewNames.CodeFileView, UriKind.Relative),
                navigation =>
                {
                    if (navigation.Result != true)
                    {
                        throw new Exception(_languageService.FindResource(WellKnownResourceKeys.CodeFileWindowNavigationFailedMessage));
                    }
                },
                new NavigationParameters
                {
                    {WellKnownParameterKeys.FileName, codeFileViewModel.Name}
                });

            var messageResult = _messageService.ShowYesNoCancelQuestion(null, _languageService.FindResource(WellKnownResourceKeys.DoYouWantToSaveChanges));
            if (messageResult == null)
                return;

            if (messageResult == true)
                if (!Save(codeFileViewModel))
                    return;
        }
        FinishInteraction?.Invoke();
    }

我在一个按钮上绑定此命令，但问题是用户也可以从Windows标准关闭按钮关闭它。如何从弹出窗口的WRAPPER（HOST）WINDOW关闭按钮调用此方法？