public override void OnExecute(SelectedItem item, string fileName, OutputWindowPane pane)
            {
                string dirname = Path.GetDirectoryName(fileName);

                if (mMainLine)
                {
                    Config options = (Config)Plugin.Options;
                    fileName = P4Operations.RemapToMain(fileName, options.MainLinePath);
                }

                P4Operations.RevisionGraph(pane, dirname, fileName);
            }