Hi Alex! Thanks very much for the help! That's exactly what I was searching for =) I posted this same question on stackoverflow <https://stackoverflow.com/questions/23977361/create-simple-graph-object-in-julia-using-graphs-jl?noredirect=1#comment36944265_23977361>. If you like to post this answer there, I'll be happy to flag it as the best response and give you some points.
Thanks again, Paulo
