GTK:Focus on tab component of tabbedpane shows the circle lead border for non-label components.

BugInfo:
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While focusing on tab component of tabbedpane,a lead border circle is showing at right side edge of the component for non title components and it looks ugly.

JDK Info:
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java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b99)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b99, mixed mode)

Steps to Reproduce:
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1. Download attached java file.
2. Execute the java file
3. Select the gtk look and feel from the menu.
4. Place the focus on first tab

Expected Result:
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Component should appear without lead border because a non title component.
Lead border should appear for titled components.

Actual Result:
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A circle lead border is showing right side edge of the component for non titled components.

Please see the attached jpg file for reference.