Choice can be seen on the JScrollPane's scrollbar when mixing of heavy weight & light weight compone

I have JScrollPane, which contains few AWT & Swing components. When the frame is realized, I resize the frame to smaller size , so that i can see both horizontal & vertical scrollbar. When i resize , i see that AWT Choice is seen on the JScrollPane's scrollbar. I tested this on jdk6 b104 , 6u10 b33 & 6u12 b02 promoted build. I have attached the screen shot . ScrollPane is one place where user will put his components.
Please refer to the page under Swing's ScrollPane http://java.sun.com/products/jfc/tsc/articles/mixing/ .

Step to Reproduce:-
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1) Run the attached testcase.
2) Resize the frame , so that you can see both the vertical & horizontal scrollbar. Observe that choice is seen vertical scrollbar. If you see the same, then the bug is not reproduced.