public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
{
UIDocument uidoc = commandData.Application.ActiveUIDocument;
Document doc = uidoc.Document;
using (Transaction t = new Transaction(doc, "Place connection"))
{
t.Start();
ConnectionsManager.PlaceCustomConnection(doc);
t.Commit();
}
return(Result.Succeeded);
}