Edit Undo Keystroke Mapping

I am developing with NetBeans 8.02 RCP app and have a peculiar problem
with my Undo/Redo implementation. The functionality is working
properly, except I can't seem to get the shortcut keys CNTL-Z and
CNTL-Y for undo/redo working properly or appearing in the Edit Main
Menu Action item.

I am using NetBean's UNDO.Manager implementation in just one
TopComponent at this time. Toolbar buttons and the Edit->Undo/Redo menu
actions do all work as expected. There are no over-rides in the
layer.xml file for any module that I can see that would impact this.

Does anyone have ideas of where I can check next? I started adding
different libraries at the project level in the editor sections, but I
really don't know which ones may even be related to the Undo
functionality.