// インスタンス作成
 public static EditModeMapAreaInnerViewModel CreateInstance(
     MapAreaInnerView mapAreaInnerView,
     EditModeViewModel parent)
 {
     var instance = new EditModeMapAreaInnerViewModel();
     instance.Parent = parent;
     instance.SetView(mapAreaInnerView);
     return instance;
 }
 public void SetViewModel(
     EditModeMapAreaInnerViewModel editModeMapAreaViewModel)
 {
     EditModeMapAreaInnerViewModel = editModeMapAreaViewModel;
     DataContext = EditModeMapAreaInnerViewModel;
 }