I have a lot of Airport devices in my Appartment, and I saw that when an Airport Express (Third Device) is connected to another Airport Express (Second Device) and that Airport Express is connected to the AirPort Extreme (first device that is connected to the modem), I Can't connect to the third device, all my devices connects automatically to the second devices, never to the third, and the assign of the hierarchy of the networks depends of the AirPort Extreme, I can't configure the order of the network. Was you can see in the image, I Have 2 devices connected in third place, and no one of my wifi devices connect to the third line of devices.
