Accelerators and mnemonics do not work when a heavyweight component is present.

In a JDialog (or JFrame) with a menubar, mnemonics and accelerators stop
working when you add a heavyweight component to the content pane.

I am aware that mixing heavyweight and lightweight components is not
particularly recommended, but there are situations where this is unavoidable,
such as in our case where we get a Component from JMF.

Attached is an test program showing this behavior.