I am building graphs with boost::graph and want to generate GraphViz output. Most everything works as expected, but I am having trouble getting two things to work correctly: 1) My subgraphs are not visualized in the GraphViz output 2) I am setting the graph_name property of both the root graph and all subgraphs, but the names never appear in the GraphViz output. Any help would be appreciated. Cheers, Graham