Menu disappears when setting layout

I'm trying to set the layout for my root pane so I can add some buttons, etc.
What happens is that if I just include the line:
root.setLayout( new BorderLayout());
then the menu doesn't show up anymore. I didn't think the root pane was at that top level. I thought the menubar went higher up, so why do these interfere?
Also, how do I correct this problem?

Do not set the layout of the root pane. You should be working with the content pane, and leave the root pane alone.

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