Looks like we just need to show the Itinerary, not the tickets.

From the consulate "Proof that you can proceed to the next country after you have visited the Schengen countries, i.e. confirmed itinerary / airline reservation or airline ticket and required visa. When you bring a confirmed itinerary / airline reservation at the time of your visa application, the actual airline ticket has be shown if your visa has been approved. Important: if you are not sure that your visa will be approved, do not buy an airline ticket yet, bring a confirmed airline reservation which can be cancelled or itinerary."