static <A> void treePopupMenu(final JTree tree, final VF2<JPopupMenu, A> fillMenu) {
  componentPopupMenu2(tree, voidfunc(JTree tree, JPopupMenu menu) {
    MouseEvent evt = componentPopupMenu_getEvent();
    TreePath path = tree.getPathForLocation(evt.getX(), evt.getY());
    if (path == null) ret;
    DefaultMutableTreeNode node = cast path.getLastPathComponent();
    tree.setSelectionPath(path);
    A a = cast node.getUserObject();
    callF(fillMenu, menu, a);
  });
}