@Override
    public void computeChildren(@NotNull XCompositeNode node) {
      if (myChildren == null) {
        myOnRootExpandAction.run();
      }
      else {
        for (XValueChildrenList children : myChildren) {
          myRoot.addChildren(children, false);
        }

        myRoot.addChildren(XValueChildrenList.EMPTY, true);
      }
    }
@Override
    public void computeChildren(@NotNull XCompositeNode node)