Bug Info:
========
Java tabbedpane renders extra color at top edge of left most corner in a selected tab by compare with native tabbedpane.

JDK Info:
=========
java version "1.6.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-beta2-b74)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b74, mixed mode)

Steps to Reproduce:
===================
1. Launch the Swingset2 Demo app.
2. Select the tabbedpane icon in toolbar.
3. Select any tab in the tabbepane.

Now you can observe some rose color at left most end of slected tab.

Please check the attached images for compare java and native.