Cocoa: Menu in menubar stays highlighted after dialog with another menu bar is opened - Mac OS X

Cocoa: Menu in menubar remains highlighted after dialog with another menu bar is opened and closed again.

In the attached example, click on the "File" menu, then select "Open Dialog". A new dialog with an empty menu bar is shown. After the "Close" button is clicked, the menu bar of the main window is restored. The file menu is still highlighted and can only be un-highlighted by clicking it again.

This only occurs using the Cocoa version. The Carbon version works fine.