Problem in Restoring the North Pane or title bar of internalframe

Hi, All I have removed the title bar of internal rame by the code ...
((javax.swing.plaf.basic.BasicInternalFrameUI) f.getUI()).setNorthPane(null);
but when i am restoring the title using the code
JComponent northPane = ((javax.swing.plaf.basic.BasicInternalFrameUI) f.getUI()).getNorthPane();
((javax.swing.plaf.basic.BasicInternalFrameUI) f.getUI()).setNorthPane(northPane);
i encountered by the exception
java.lang.Error: Do not use GraphManager.PieChart.add() use GraphManager.PieChart.getContentPane().add() instead
which is for the line setNorthPane(northPane)
this pie chart is my internal frame and i have already used getContentPane method...
to add components.....
Thanx in advance
Ravi

I solve my problem with the help for the tpic : "System menu of JInternalFrame". it explains how to change the NorthPane's component layout. I'm not too sure where this help topic is, but what's happening is with the following error message:
java.lang.Error: Do not use GraphManager.PieChart.add() use GraphManager.PieChart.getContentPane().add() instead
is that Sun's engineers are doing what the API documentation is telling the developers not to do and adamantly refused to correct it. I did run across a bug report and Sun's response is something like this:
the only effective way to handle changes to the title bar or the NorthPane is by using the setUI method...
;o)
V.V.

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Problem in Restoring the North Pane or title bar of internalframe

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