I am trying to create an example similar to the Paris Multi-modal Network. However, I could not get the points feature classes(Metro Entrances and Stations) to appear when asked about selecting feature classes sources to participate in the network. These point feature classes were imported to the feature dataset but they don't show to be selected as sources when I start creating a new network Dataset. I have noticed that in the Paris Example the train stations and the entrance points were represented by points on top of lines in the network dataset properties. What could be the reason in my case?