private void ChooseFolder()
        {
            VistaFolderBrowserDialog dialog = new VistaFolderBrowserDialog();

            if (Directory.Exists(NotesManager.NotesFolder))
            {
                dialog.SelectedPath = FileUtils.AddDirectorySeparator(NotesManager.NotesFolder); // open current folder, not just select its name
            }
            if (dialog.ShowDialog(this).GetValueOrDefault(false))
            {
                NotesManager.NotesFolder = dialog.SelectedPath;
            }
        }