Shortcuts in Swing? (question for pals from Apple)

[Alexander Potochkin]

Hello guys

We have a code snippet which tests the various shortcuts in a simple 
Swing application,
Alt+A and Alt+B are among them.

It turned out that when the focus is inside a JTextArea,
Alt+A works as expected but Alt+B types a special symbol.

This behavior is different from what we have on Windows or Linux
and our testers consider it as a bug.

Is there any workarounds to suppress typing on Alt+B?
(Alt+B + some other magic keys?)

If not, is there a specification that counts the shortcuts that can't be 
mapped to the users action?

By the way, how to move the focus out of a focused JTextArea on Mac?
On windows we use Ctrl+Tab, but it doesn't work on Mac.

Thanks much
alexp