Weird QMenu behavior on Mac

[munna]

Hi!

When I set palette on QMenu it doesn't seem to be working. The following is the code

Selector_Menu::Selector_Menu(QWidget *parent) : QMenu(parent)
{
    setMinimumWidth(52);
 
    setAutoFillBackground(true);
 
    QPalette p = palette();
    p.setColor(QPalette::Window, QColor(5, 5, 5));
    setPalette(p);
}

Selector_Menu::Selector_Menu(QWidget *parent) : QMenu(parent)
{
    setMinimumWidth(52);

    setAutoFillBackground(true);

    QPalette p = palette();
    p.setColor(QPalette::Window, QColor(5, 5, 5));
    setPalette(p);
}

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I add actions to this menu from the function where I create this object. Something like this

menu = new Selector_Menu(this);
currentAction = menu->addAction("A");
menu->addSeparator();
menu->addAction("B");
menu->addSeparator();
menu->addAction("C");

menu = new Selector_Menu(this);
currentAction = menu->addAction("A");
menu->addSeparator();
menu->addAction("B");
menu->addSeparator();
menu->addAction("C");

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Output looks like the Picture1 attached

When I use stylesheets I get the output which looks like the Picture2 attached

RMS_Output_Assignment_Selector_Menu::RMS_Output_Assignment_Selector_Menu(QWidget *parent) : QMenu(parent)
{
    setMinimumWidth(52);
 
    setAutoFillBackground(true);
 
    QString menu_ss = "QMenu { color: white; background-color: black; }" +
                        QString("QMenu::item:selected { color: grey; background-color: black; }");
    setStyleSheet(menu_ss);
}

RMS_Output_Assignment_Selector_Menu::RMS_Output_Assignment_Selector_Menu(QWidget *parent) : QMenu(parent)
{
    setMinimumWidth(52);

    setAutoFillBackground(true);

    QString menu_ss = "QMenu { color: white; background-color: black; }" +
                        QString("QMenu::item:selected { color: grey; background-color: black; }");
    setStyleSheet(menu_ss);
}

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Any idea on why is the background not being set properly in the menu. I am using Qt 4.3.1

Thanks a lot for the help