/// <summary>
 /// Adds some files to the list of template files.
 /// </summary>
 /// <param name="result">A result of <see cref="OpenFileDialogAction"/>.</param>
 private void AddTemplateFiles(OpenFileDialogActionResult result)
 {
     this.TemplateFiles = this.TemplateFiles.Union(result.FileNames);
 }
 /// <summary>
 /// Selects a score file.
 /// </summary>
 /// <param name="result">A result of <see cref="OpenFileDialogAction"/></param>
 private void SelectScoreFile(OpenFileDialogActionResult result)
 {
     this.ScoreFile = result.FileName;
 }