https://forums.x-plane.org/index.php...e/16221-x-fmc/

Bug #202: Flight plan not appearing until departure SID selected
Bug #234: X-FMC Datarefs not shown in DatarefEditor
Feature #209: LNAV improvement
Feature #231: New navigation mode
Feature #232: Command Key and menu item for X-FMC pop-up
Feature #233: x737 new behavior