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The bottom panel from folder chooser panel is not accessible through the projectuiapi. It is supposed to be used for including additional custom data according to the UI spec.
Similarly java package chooser panel should give access to that panel.
Actually a defect since the UI spec requests it, I guess.
The API/impl for both Simple and Java TargetChooser is in CVS. Web team please test.
The custom panel is available. Tested in Java Package Chooser Panel.