QMenu without shadow

[furj]

Good day.

How can I make context QMenu without shadow. The following code does not work:

QPushButton button;
QMenu *menu = new QMenu(button);
 
QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect();
effect->setBlurRadius(100);
effect->setXOffset(100);
menu->setGraphicsEffect(effect);
 
button->setMenu(menu);

QPushButton button;
QMenu *menu = new QMenu(button);

QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect();
effect->setBlurRadius(100);
effect->setXOffset(100);
menu->setGraphicsEffect(effect);

button->setMenu(menu);

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Any ideas?