@Nullable
  private VirtualFile getFileFromSelection() {
    final TreePath path = myTree.getSelectionPath();
    if (path != null) {
      Object component = path.getLastPathComponent();
      VirtualFile file = null;
      if (component instanceof MyFileNode) {
        component = ((MyFileNode)component).getParent();
      }
      if (component instanceof MyDuplicatesNode) {
        file = ((MyDuplicatesNode)component).getUserObject().iterator().next();
      }
      return file;
    }
    return null;
  }
@Nullable
  private VirtualFile getFileFromSelection()