show values that are not currently selectable, based
upon previous field selections. If shown, the
unselectable values are clearly identified as such
and do not highlight when the pointer is moved down
the menu. The full name of this resource is
ffffiiiieeeellllddddNNNN....mmmmeeeennnnuuuu....ooooppppttttiiiioooonnnnssss....sssshhhhoooowwwwUUUUnnnnsssseeeelllleeeeccccttttaaaabbbblllleeee, class