QToolButton menu-button position

[awats979]

Hi, I would expect this menu-button to appear below the QToolButton, however it always appears to the right. How do I specify the location of the menu-button relative to the QToolButton with stylesheets?

#include "mainwindow.h"
#include "qtoolbutton.h"
#include "qmenu.h"
#include "qgridlayout.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    QWidget wig;
    QGridLayout* layout = new QGridLayout();

    QString style =
    "QToolButton[popupMode=\"1\"]{"
    "   background: pink;"
    "   }"
    "QToolButton::menu-button {"
    "    subcontrol-position: bottom;"
    "    subcontrol-origin: margin;"
    "    background: red;"
    "}";

    a.setStyleSheet(style);

    QMenu *menu = new QMenu();
    QAction *testAction = new QAction("test menu item");
    menu->addAction(testAction);

    QToolButton* toolBtn = new QToolButton();
    toolBtn->setText("Tool Button");
    toolBtn->setMenu(menu);
    toolBtn->setPopupMode(QToolButton::MenuButtonPopup);

    layout->addWidget(toolBtn);
    wig.setLayout(layout);
    w.setCentralWidget(&wig);
    w.show();
    return a.exec();
}