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I'm trying to color an alpha shape which I have visualized with the 
Geomview_stream class:

        CGAL::Geomview_stream gv(CGAL::Bbox_3(0,0,0, 2, 2, 2));
        gv.clear();
        gv.set_line_width(5);
        gv.set_trace(false);
        gv.set_bg_color(CGAL::Color(255, 255, 255)); //white
        gv.set_vertex_color(CGAL::Color(255, 0, 0)); 
        gv.set_edge_color(CGAL::Color(0, 255, 0)); 
        gv.set_face_color(CGAL::Color(0, 0, 255)); 
        gv << as;               

The thing is that only the background is colored white. The simplicities do 
not change color.

What am I doing wrong?

Thanks in advance.

Regards,
Henrik