int CopyIfSelected(TreeCtrl& dst, int did, const OptionTree& src, int id)
{
	TreeCtrl::Node x = src.GetNode(id);
	x.ctrl = NULL;
	int orig = did;
	if (src.Get(id))
		did = dst.Add(did, x);
	dst.Open(orig);
	for(int i = 0; i < src.GetChildCount(id); i++)
		CopyIfSelected(dst, did, src, src.GetChild(id, i));
	return did;
}