Cosmetic pen with opengl rendering

Hi all,
I try to set the cosmetic pen for QGraphicsPolygonItem but if I use the opengl render it doesn't work as I expect.
Here the code:

Code:

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scene.setSceneRect(-0.0005,-0.0005,0.001,0.001);
 
	QPen pen;
	pen.setColor(QColor(Qt::red));
	pen.setCosmetic(true);
 
	QPolygonF polyF;
	polyF << QPointF(0.0002,0.0002)
			<< QPointF(0.0003,0.0002)
			<< QPointF(0.0003,0.0003)
			<< QPointF(0.0002,0.0003);
 
	QGraphicsPolygonItem* polyItem = new QGraphicsPolygonItem(polyF);
 
	polyItem->setPen(pen);
 
	scene.addItem(polyItem);
 
	ui->graphicsView->setBackgroundBrush(Qt::black);
	ui->graphicsView->setCacheMode(QGraphicsView::CacheBackground);
	ui->graphicsView->setRenderHint(QPainter::Antialiasing);
	ui->graphicsView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
	ui->graphicsView->setScene(&scene);

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if I comment out the following code line it works fine.

Code:

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ui->graphicsView->setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));

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Thanks,
Giuseppe

Quote:

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Detailed Description

The QGLWidget class is a widget for rendering OpenGL graphics.

QGLWidget provides functionality for displaying OpenGL graphics integrated into a Qt application. It is very simple to use. You inherit from it and use the subclass like any other QWidget, except that you have the choice between using QPainter and standard OpenGL rendering commands.

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Note the inherit bit.