Drawing a Bezier curve in QGraphicsScene[SOLVED]

Hi,
In my application I have to draw an Edge (curve) defined by 10 control points (Spline) as a QPainterPathItem in a graphic scene. The QPainterPath class provides only two functions to draw Bezier curves (4 control points) which are : cubicTo() and quadTo().Is theire any solution to do that such as transforming the Spline to a Bezier curves ?
thanks in advance.