I have a Frame which contains a JMenu, two JPanels, first panel contains JButton added to the north of the frame & second JPanel contains a AWT Button, choice, list ,Checkbox & a SwingList. When i open either the JMenu or JComboBox Popup. & i can drag the tumb of the AWT List scrollbar & event click on the up & down arrow of the scrollbar , so that i can navigate, but when i click on the list item the either the JMenu or JComboBox popup gets closed.

Step to reproduce:-
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1) Run the attached testcase.
2) Press F10 to see the JMenu. or Click on the JComboBox, so the you can see Jcombobox's popup.
3) Click on the arrow buttons of the AWT List or drag the tumb up & down. If you can able to do this action, then the bug is reproduced.

I tested this on winxp & vista home premium with 6u12 b01 pit build.