Gtk::TreeModel::iterator ModelTreeBox::getIterFromMdl(const graph::Model* mdl, Gtk::TreeModel::iterator iter, Gtk::TreeModel::Children child)
{
    while (iter != child.end()) {
        if ((*iter).get_value(m_columns.mModel) == mdl) {
            return iter;
        } else {
            if (???) {
               return getIterFromMdl(mdl, ???);
            } else {
                iter++;
            }
        }
    }
}