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void TreeModel::selectIndex(QModelIndex ix) {
  if (!ix.isValid()) return;
  qDebug() << "name1" << ix.data();
  tree->selectionModel()->clear();
  tree->setExpanded(ix.parent(), true);
  tree->selectionModel()->setCurrentIndex(ix, QItemSelectionModel::SelectCurrent);
  tree->scrollTo(ix);
}

name1 QVariant(QString, "Highlight elements") 
The program has unexpectedly finished.
C:\Home\develop\qt\arm\designer\Designer exited with code -1073741819

tree->selectionModel()->setCurrentIndex(ix, QItemSelectionModel::SelectCurrent); 

void MainWindow::showEvent(QShowEvent *event) {
  QMainWindow::showEvent(event);
  QTimer::singleShot(0, this, SLOT(selectLastNode()));
}