How render native opengl and mix with QPainter on QwtPolarPlot?

[sampad1370]

Hi
I need to mixed shader render opengl with QPainter that render on QwtPolarPlot that is inside of draw function of QwtPolarItem!!!
but how can do this?
I do that but don't see anything with follow code:

class Item :public QwtPolarItem
{
 
 
	void draw(QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
						  const QPointF &pole, double radius, const QRectF &canvasRect)
	{
		Q_UNUSED(center);
		Q_UNUSED(elapsed);
 
		painter->scale(0.1, 0.1);
		painter->setPen(...);			
 
		painter->setRenderHint(QPainter::HighQualityAntialiasing);
 
		painter->drawPie(...);
 
		painter->setPen(...);
		painter->drawEllipse(...);
		painter->setPen(...);
		painter->drawLine(...);
 
		painter->setPen(...);
		painter->drawEllipse(...);
 
		painter->save();
 
		QMatrix mx;
		mx.reset();
		painter->setMatrix(mx);
 
		painter->beginNativePainting();
		glClearColor(0, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);
		glLoadIdentity();
		//glTranslatef(center.x(), center.y(), 0);
		glColor3b(255, 255, 255);
 
		glBegin(GL_LINES);
		glVertex2d(0, 0);
		glVertex2d(100, 0);
		glVertex2d(0, 100);
		glVertex2d(100, 100);
		glEnd();
		glFlush();
		painter->endNativePainting();
 
		painter->restore();
	}
...
}

class Item :public QwtPolarItem
{

 
	void draw(QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
						  const QPointF &pole, double radius, const QRectF &canvasRect)
	{
		Q_UNUSED(center);
		Q_UNUSED(elapsed);

		painter->scale(0.1, 0.1);
		painter->setPen(...);			

		painter->setRenderHint(QPainter::HighQualityAntialiasing);

		painter->drawPie(...);

		painter->setPen(...);
		painter->drawEllipse(...);
		painter->setPen(...);
		painter->drawLine(...);

		painter->setPen(...);
		painter->drawEllipse(...);
		
		painter->save();

		QMatrix mx;
		mx.reset();
		painter->setMatrix(mx);

		painter->beginNativePainting();
		glClearColor(0, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);
		glLoadIdentity();
		//glTranslatef(center.x(), center.y(), 0);
		glColor3b(255, 255, 255);

		glBegin(GL_LINES);
		glVertex2d(0, 0);
		glVertex2d(100, 0);
		glVertex2d(0, 100);
		glVertex2d(100, 100);
		glEnd();
		glFlush();
		painter->endNativePainting();

		painter->restore();
	}
...
}

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Also I know some mistake for example don't set clear color and clear color buffer and flush buffer.
Also I must render first painter then opengl.
please answer me for this code and typical way to render and please say any problem you see in my code.
thanks.