J2SE Version (please include all output from java -version flag):
 java version "1.4.0-rc"
 Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-rc-b91)
 Java HotSpot(TM) Client VM (build 1.4.0-rc-b91, mixed mode)

Does this problem occur on J2SE 1.3? Yes / No (pick one)
 Yes
 
Operating System Configuration Information (be specific):
 Windows

Bug Description:
In native Windows, when interacting with a MessageBox(...), one can use the
arrow keys to navigate between buttons (e.g. <- is the same as Shift-Tab and
-> the same as Tab). This is apparently not currently supported by
JOptionPane. Arguably, JOptionPane should mimic MessageBox.