@Override
  public @NotNull VirtualFile createChildDirectory(Object requestor, @NotNull VirtualFile vDir, @NotNull String dirName) {
    final DummyDirectoryImpl dir = (DummyDirectoryImpl)vDir;
    DummyFileBase child = new DummyDirectoryImpl(this, dir, dirName);
    dir.addChild(child);
    fireFileCreated(requestor, child);
    return child;
  }
@Override
  public @NotNull VirtualFile createChildDirectory(Object requestor, @NotNull VirtualFile vDir, @NotNull String dirName)