EMX Application, Cobra, Domino, Mini, Panda, Panda II, or Rhino.
When I used “EMX Application”, FEZ_Pin remains undefined.
Or, another way to put the question, what core assemblies should I use for the FEZ Spider Starter Kit?
Check the GettingStarted tutorial which is part of the Gadgeteer SDK installation.
in the tutorial, you’ll find out there is a new Gadgeteer template that gets installed in VS, and the designer is sweet!
You do not use NONE of them 
Microsoft have done a terrific job in the designer they added. Follow this please http://wiki.tinyclr.com/index.php?title=Gadgeteer