User Portlet User Portlet

Discussions
Thank you for the answer Gianluca Gorni. I'll take a look at that too.
First of all, thank you for your answer. I simply tried Graph[{1 -> 2, 2 3}] and I have this error message : Graph::supp: Mixed graphs and multigraphs are not supported. I tried copying exactly you code and I have the same error. Could it be...