How to plot filled polygons in QwtPlot

[EliGri]

Hi,
I'm looking for an example that will help me plot filled polygons from a Voronoi diagram in a QwtPlot chart widget.
http://en.wikipedia.org/wiki/Voronoi_diagram

I can currently generate the Voronoi diagrams, extract closed polygons for each Voronoi cell, and post the polylines in QwtPlot. I can also add RGB color attributes to these cells; however, I'd like to take this one step further by plotting each filled polygon in a QwtPolt widget by the colors I've generated.

Any help is appreciated.