How can I handle an alt graph keystroke?

I want to add a keyboard binding to a JTextField, but I cannot make it work using the alt graph key.

I followed the keyboard bindings tutorial and tried this:

inputMap.put(KeyStroke.getKeyStroke("altGraph ENTER"), ...
inputMap.put(getKeyStroke(KeyEvent.VK_O, InputEvent.ALT_GRAPH_DOWN_MASK), ...
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but the action is never triggered. If I replace altGraph with alt it works.

What can I do to make it work?

If it matters: I'm using Java 6 and Windows.

Did you try

KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.ALT_GRAPH_DOWN_MASK)

?