I just figured it out. Plug your Ipad into your system and in the Summary tab of your device, go to Options and check the box "Sync with this Ipad over wi-fi". Click apply and then unplug the ipad and shut down iTunes. Plug the device into the power unit and start iTunes. Give it a few seconds then you should see the Sync Now button working. If you leave it alone for ab bit, it will sync on it's own.