setSVGDocument in JSVGCanvas

Hi,
I have a problem with using the setSVGDocument method in JSVGCanvas.
The SVG document that I want to render on the JSVGCanvas is generated by 
my program. When I want to render that document nothing seems to happens 
(if I use listeners on the canvas I can see that the document is build, 
and then rendered, but nothing is shown on the canvas).
I have tried to render SVG documents from a URI and that works. I have 
also tried to save the SVG document generated by my program to a file 
and that works also (I can view the SVG perfectly in Adobes Viewer).
What do I have to do to get the setSVGDocument method to work?

My code:

            DOMImplementation domImpl = 
SVGDOMImplementation.getDOMImplementation();
            String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
            Document document = domImpl.createDocument(svgNS, "svg", 
null);
            SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
            paintRenderer(svgGenerator);	//--> paints shapes on the 
graphics context
            Element svgRoot = document.getDocumentElement();
            svgRoot.setAttributeNS(null, "width", "400");
            svgRoot.setAttributeNS(null, "height", "450");

         setSVGDocument((document);

Many thanks,
Don