Tabs in TabbedPane behave wierdly in Scroll Layout in GTK.

Steps to reproduce:
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1) Unzip the Attached Zip file and compile and execute SynthTest.java .
2)Change the Look and Feel to GTK. (Theme file used is GTK2) .Click the right scroll Button. Keep on clicking.
3) After a while you will notice that the tabs are not visible but they are still clickable.
This is done on build 32.