Styling QMenubar???

[Lykurg]

You have a typo! Skip the ")".

menubar->setStyleSheet("background-color: red;");

menubar->setStyleSheet("background-color: red;");

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[anupamgee]

I corrected that but still not showing the menubar
if i skip the line menubar->setStyleSheet("background-color: red;");
it shows the normal qmenubar.
what is the problem in setting stylesheet

[Lykurg]

It's because you have not put the menubar in a layout! If you don't want to do so call

menubar->adjustSize();

menubar->adjustSize();

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then the menu bar is shown. (Skip your geometry line.)