@Override
  public void navigateFolder(ContentEntry contentEntry, ContentFolderRef contentFolderRef) {
    final VirtualFile file = contentFolderRef.getFile();
    if (file != null) { // file can be deleted externally
      myEventDispatcher.getMulticaster().navigationRequested(this, file);
    }
  }
@Override
  public void navigateFolder(ContentEntry contentEntry, ContentFolderRef contentFolderRef)