How can i repair the central locking on my renault clio so the boot locks as well as the doors?

When i lock my car (an 02 reg Renault Clio) using the central locking system the doors lock but the boot remains unlocked. I think this may have been because the dealer made it this way so he could open the boot when the car was on show without having to find the key to open it. Any ideas what needs to be done to repair this?|||could be a problem with the motor driving the lock in the boot? check the wiring and fuses, look in the car manual to see which ones they are or maybe replace the motor if thats the problem, is the car not under warantee? take it back and get them to look at it