Howto listen for global key down events

How do I listen for key down events in the whole browser window,
independent of what component has the focus? The code below doesn't do
it. What's wrong? Actually I need to bind shortcut keys to components.
I know about the setAccessKey(char) method but this only handles the
alt key (Windows). I need to bind other combinations like combinations
including ctrl. Is this possible with GWT and how could it be done?

RootPanel.get().addHandler(new KeyDownHandler() {
public void onKeyDown(KeyDownEvent event) {
GWT.log("onKeyDown charCode=" + event.getNativeKeyCode());
}
}, KeyDownEvent.getType());

Any help appreciated, thanks!

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