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class MyCombo : public QComboBox
{
public:
   MyCombo(QWidget *parent) : QComboBox(parent), m_arrowWidth(18)
   {
   }
   void MyCombo::paintEvent ( QPaintEvent * event )  
   {
      //return QComboBox::paintEvent(event);
      QStylePainter painter(this);
      painter.setPen(palette().color(QPalette::Text));
      QStyleOptionComboBox opt;
      initStyleOption(&opt);
      painter.drawComplexControl(QStyle::CC_ComboBox, opt);
      opt.direction = Qt::RightToLeft;

      if( style() )
      {
         QRect rc = style()->subControlRect(QStyle::CC_ComboBox, &opt, QStyle::SC_ComboBoxArrow, this);
         m_arrowWidth = rc.width();
      }
      opt.rect.setRight(opt.rect.right() - m_arrowWidth);
      painter.drawControl(QStyle::CE_ComboBoxLabel, opt);
   }

private:
   int m_arrowWidth;
};
class MyDelegate : public QItemDelegate
{
public:
   MyDelegate(QWidget *parent): QItemDelegate(parent)
   {}
   void paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const   
   {
      QStyleOptionViewItem myOption = option;

      myOption.rect.setRight(option.rect.right() - 18);  //@TODO breite des pfeiles
      QItemDelegate::paint(painter, myOption, index);
   }
};


 MyCombo *mComboBox3 = new MyCombo(dlg1);
   mComboBox3->setItemDelegate(new MyDelegate(mComboBox3));
   mComboBox3->addItem("1.000");
   mComboBox3->addItem("2.000");
   mComboBox3->addItem("345.000");
   mComboBox3->addItem("9.000");

   for(int i = 0; i < mComboBox3->count(); i++)
      mComboBox3->setItemData(i, Qt::AlignRight, Qt::TextAlignmentRole);