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Now the topSeparator (and bottomSeparator) in SwingFrameContainer are the NbiSeparator objects (extended from JSeparator). The purpose of this separator has nothing in common with separators in the menu; actually it is used as the visial separator of the titlePanel and the main panel contents. Another separator structure should be used to present topSepator, something like two 1px lines: gray at the top and white at the bottom.
the issue was reported by jefflin at netbeans dot org while his work on OpenESB installer (~13.12.2007)
Assigned to new owner.