This is the same issue as described in bug id 4171437, the bug is
supposedly fixed in JDK1.2.2.

Bug id 4171437:
"In the case of a mnemonics conflict, preference is given to the top level menu instead of the menuItem below the selected menu.

The attached sample program shows the problem.

To test:
1. Run the example program:

java AcceleratorTest

2. Note that when you press "Alt f c" that the Custom menu gets
selected instead of File->Close.

Although the selection of File->Close is *not* what you would normally see under Unix, it *is* what's considered normal behavior under WinNT.

In essence, the behavior is not what Window "power users" expect to see, at least, my ISV "

I ran the testcase AcceleratorTest on both JDK1.2.2_006 and JDK1.3
and the bug is not fixed. The testcase is located in the attachments.