How to disable the F4 Key Event?

Hi Guys,
I have written my own FocusManager which allows me to traverse through disabled components. If a user presses the F4 key while the focus is in a disabled JComboBox, the popup becomes activated. Is there any way deactivate the F4 keystroke?
I have tried:
event.consume();
combobox.setPopupVisible(false);
combobox.hidePopup();
I also read that F4 is a low-level event maintained by Windows. Is this true? Is there no alternative?
-Sri :)

To anyone who may be interested:
I have tried all available solutions:
1. hidePopup()
2. setPopupVisible(false)
3. unregistering the F4 key event
4. catching the F4 key event and snubbing it
I have had no luck with the above solutions. It leads me to believe that F4 key is registered under the windows environment and it is a low-level event.
-Sri :)

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