The following navigation, activation and selection keyboard bindings on JMenu for proper operation and key binding sequences.

JMenu
Post - Enter
Un-post - Esc (steps back one post at a time, e.g. unpost
backward from submenu in following menubar
sequence F10>f>down arrow>submenu)
Enter
Navigate within - Arrow keys
R(L) arrow posts a submenu

earl.johnson@Eng 1998-05-24 Added:

Default or selected action - Enter (unposts menu)