!7

static int n = 3;

p-subst {
  swingBiggerFonts();
  
  final JTree tree;
  tree = jDynamicTree("Root", func(S s) -> L<S> {
    ll(s + "/child 1", s + "/child 2")
  }, keepChildrenOnCollapse := true);
  showFrame(tree);
  
  doEvery(5.0, r {
    jDynamicTree_addToNode(tree, "Root", "child " + n++)
  });
}