Difference between what a QGraphicsScene shows and what I save

Hi to all,
I'm having trouble saving the image showed in a QGraphicsScene. Here is an application's screenshot (screen-01.jpg) that worth more than thousands words:

http://www.qtcentre.org/asset.php?fi...8&d=1264742723

it's an histogram that shows two values, and the following is the resulting image saved (statistiche.png):

http://www.qtcentre.org/asset.php?fi...8&d=1264742721

it's, incredibly, without the green values.
Ok, I'm going to show you my code to build the histogram and save it:

Code:

// Build the Histogram
void frmStats::setupGrafico()
{
//   qDebug() << "frmStats setupGrafico";
 
   if (maxCifraAnno == 0)
   {
      singolaUnitaIsto = 0;
   }
   else
   {
      singolaUnitaIsto = - 1 * (double(maxAltezzaIsto) / double(maxCifraAnno));
   }
 
   scene->clear();
 
// X line
   QGraphicsLineItem *ascissa =
      new QGraphicsLineItem(QLine(margineX, endY - margineY, endX - 10,
      endY - margineY), 0, scene);
   ascissa->setPen(QPen(Qt::black, 3, Qt::SolidLine));
 
// Y line
   QGraphicsLineItem *ordinata =
      new QGraphicsLineItem(QLine(margineX, 10, margineX, endY - margineY), 0,
      scene);
   ordinata->setPen(QPen(Qt::black, 3, Qt::SolidLine));
 
   for (int i = 1; i < 4; i++)
   {
// 25%, 50% and 75% lines
      int factorY = ((endY - margineY) / 4) * i;
      QGraphicsLineItem *livelliY =
         new QGraphicsLineItem(QLine
         (margineX, factorY, endX - 10, factorY), 0, scene);
      livelliY->setPen(QPen(Qt::black, 1, Qt::DashLine));
 
      QGraphicsTextItem *testoPercentuale =
         new QGraphicsTextItem(QString::number(100 - (25 * i)) + "%", 0, scene);
      int h = int(testoPercentuale->boundingRect().height() / 2);
      int w = int(testoPercentuale->boundingRect().width());
      testoPercentuale->setPos(margineX - w, factorY - h);
   }
 
   QString inEuro;
 
   QFont font;
   font.setPointSize(14);
 
   for (int i = 0; i < 12; i++)
   {
      /*
        Draw the histogram's values per month
      */
      QGraphicsRectItem *isto =
         new QGraphicsRectItem(QRect(margineX + 1 + 60 * i, endY - margineY - 1,
         60, int(totMese[i] * singolaUnitaIsto)), 0, scene);
      isto->setPen(QPen(Qt::black, 1, Qt::SolidLine));
      isto->setBrush(Qt::green);
      isto->setOpacity(0.7);
 
      /*
        histogram' s text
      */
      inEuro = QString("%L1").arg(totMese[i] ,12,'f',2,' ');
 
      QGraphicsTextItem *testoIsto =
         new QGraphicsTextItem("", 0, scene);
      testoIsto->setFont(font);
      testoIsto->setDefaultTextColor(Qt::black);
      testoIsto->setHtml(inEuro);
      int xSize = int(testoIsto->boundingRect().height());
      testoIsto->setPos(margineX + 2 + 30 - int(xSize / 2) + 60 * i,
         (endY - margineY - 2));
      testoIsto->rotate(-90);
      testoIsto->translate(20, 0);
      /*
        Porto in fronte - di livello - il testo con setZValue.
      */
      testoIsto->setZValue(0.1);
 
      /*
        Month's text
      */
      QGraphicsTextItem *testoMese =
         new QGraphicsTextItem(mesiAnno.at(i), 0, scene);
      int h = int(testoMese->boundingRect().height() / 2);
      int w = int(testoMese->boundingRect().width() / 2);
      testoMese->setPos
         (margineX + 30 - w + 60 * i, (endY - (margineY / 2 + h)));
   }
}

Code:

// Print the image
 
void frmStats::creaFileHtml()
{
//   qDebug() << "->frmStats creaFileHtml";
 
   QPixmap pixmap(endX, endY);
   QPainter painter(&pixmap);
   painter.setRenderHint(QPainter::Antialiasing);
   scene->render(&painter);
   painter.end();
   pixmap.save(QDir::currentPath() + "/statistiche.png");
 
//   qDebug() << QDir::currentPath() + "/statistiche.png";
}

and that's all, please help me!
thanks