Painting primitive elements-PanelMenu does not show

[MasterBLB]

Hi Brothers

Why the code below does not work?I mean,only the frame is painted.
parallelMenu is a descendant of QWidget.

void parallelMenu::paintEvent(QPaintEvent *e)
{
	QPainter p(this);
 
	QStyleOptionMenuItem menuOpt;
             menuOpt.initFrom(this);//the rect is set in the constructor by setGeometry
 
	QStyle *s=style();
 
	s->drawPrimitive(QStyle::PE_PanelMenu,&menuOpt,&p);
	s->drawPrimitive(QStyle::PE_FrameMenu,&menuOpt,&p);
}

void parallelMenu::paintEvent(QPaintEvent *e)
{
	QPainter p(this);

	QStyleOptionMenuItem menuOpt;
             menuOpt.initFrom(this);//the rect is set in the constructor by setGeometry

	QStyle *s=style();
	
	s->drawPrimitive(QStyle::PE_PanelMenu,&menuOpt,&p);
	s->drawPrimitive(QStyle::PE_FrameMenu,&menuOpt,&p);
}

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