I have searched the SDK help and searched this forum, but I can't find an answer to this. Admittedly I'm a rookie, but I have changed many airports in the past using the SDK by adding Scenery or SimObjects. For this (and all my previous alterations), I just created a new directory duplicating the SimpleScenery files as I have done probably 50 times.
For the first time I thought I'd add a Taxiway Sign, so I selected that and clicked Add and got "An Airport is Needed." I don't understand this - I'm at KPBI, I've loaded the XML file, and I'm not sure what else I would need to do. I'm looking right at the airport. I can add Scenery and SimObjects just fine, so I'm not clear on how the SDK has decided that for this option and a few others that I'm no longer at an airport.
If you could guide me to some help doc for this I would appreciate it. Thanks.