Xceed.Wpf.Toolkit.MessageBox.Show C# (CSharp) Method

    public static MessageBoxResult Show( Window owner, string messageText )
    {
      return Show( owner, messageText, string.Empty, MessageBoxButton.OK, (Style) null );
    }

        private void OpenMenuItem_Click(object sender, RoutedEventArgs e)
        {
            var openDialog = new FolderBrowserDialog
            {
                BrowseFiles  = false,
                BrowseShares = true,
                Title        = "Select an ECMA XML documentation directory:"
            };

            if (openDialog.ShowDialog(this) == true)
            {
                var docsDir = Path.Combine(openDialog.SelectedPath, "en");
                if (Directory.Exists(docsDir) && File.Exists(Path.Combine(docsDir, "index.xml")))
                {
                    // save the last opened docs
                    Settings.Default.LastUsedPath = docsDir;
                    Settings.Default.Save();

                    OpenDirectory(docsDir);
                }
                else
                {
                    MessageBox.Show(
                        "The selected directory is not the toplevel directory for ECMA XML documentation. Those should contain a subdirectory 'en' and a file 'en\\index.xml'",
                        "Not an ECMA XML Documentation Directory",
                        MessageBoxButton.OK,
                        MessageBoxImage.Error);
                }
            }
        }