Hi Kweeheong, Solution 2 is what I would have suggested. I can't think of any obvious gotchas. Cheers, Jeremy On Sat, 26 Oct 2002, kweeheong wrote: tan.k.> tan.k.> Solution 2 : tan.k.> ------------ tan.k.> - Change the definition of GraphvizDigraph to : tan.k.> typedef subgraph<adjacency_list<boost::vecS, boost::vecS, boost::bidirectonalS, GraphvizVertexProperty, GraphvizEdgeProperty, GraphvizGraphProperty> > GraphvizDigraph; tan.k.> - Recompile bglviz.lib tan.k.> - Now GraphvizDigraph is bidirectional tan.k.> tan.k.> I prefer Solution 2 because it leverages the generic way that BGL tan.k.> has been written. I am able to rebuild bglviz.lib and my minimal tan.k.> testing shows the bidrectional GraphvizDigraph seems to work so tan.k.> far. tan.k.> tan.k.> I would like feedback whether there are any gotchas with Solution tan.k.> 2. tan.k.> tan.k.> Thanks, tan.k.> tan.k.> ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ----------------------------------------------------------------------