Inheritance: System.EventArgs
 public static void OnTryCreateNewPlus(object sender, TryCreateEventArgs e)
 {
     if (TryCreateNewPlus != null)
     {
         TryCreateNewPlus(sender, e);
     }
 }
 /// <summary>
 /// 引き継いで新規作成
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="arg"></param>
 private void OnTryCreateNewPlus(object sender, TryCreateEventArgs arg)
 {
     if (IsDirty)
     {
         if (AskSaving() == AskSaveResult.Cancel)
         {
             return;
         }
     }
     _fileService.CreateNewPlus(arg.iEditor);
 }