Context menu doesn't show submenu statustip properly

When creating context menus having submenus, selecting sumbenu items of a menu shows statustips of a previously selected non-submenu menu item, not the hovered item.
Screenshot of the QT example E:\QT\4.6.0\examples\mainwindows\menus with slightly modified function contextMenuEvent (one line added) illustrates the problem.
Modified function:
void MainWindow::contextMenuEvent(QContextMenuEvent *event)

{ QMenu menu(this); menu.addAction(cutAct); menu.addAction(copyAct); menu.addAction(pasteAct); menu.addMenu(formatMenu); // The added line menu.exec(event->globalPos()); }