JDK-4753342 : JFrame, JWindow and JDialog should redirect add/remove methods to ContentPane
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To provide a more consistant API and help ease of use JFrame, JWindow, JDialog and JInternalFrame should redirect add/remove/setLayout to the contentpane.
BugTraq+ Release Management Values
COMMIT TO FIX:
All of the Swing classes that implement RootPaneContainer (JFrame, JWindow,
JDialog, JInternalFrame and JApplet) will not forward remove/add/setLayout to the contentPane if rootPaneCheckingEnabled is true.
This means you can now do:
and it will just work.