JUNG: Saving graph into image file

Question

I use JUNG to visualize my graph / network. Now i want to save the graph (as seen in the VisualizationViewer) in a image file. I use the paint() / paintAll() function of the VisualizationViewer (who extend JPanel). But with this function, only the part who is actually shown in the VisualizationViewer (for example after zooming in) is in the image. I want to draw all Vertexes and Edges. Is there a way to draw all Elements?