Horizontal Scroll Bar Issues with tab panel

Hello all
I am using Tab Panel (With single tab).
In this Tab Panel I am adding another Tab Panel (With single tab).
In the above Tab Panel I am adding another Tab Panel. (With 15 tab).

And for third & inner most Tab Panel I used auto horizontal tab scroll
true. Like this :

taskTabPanel.setEnableTabScroll(true);

There are 15 tabs in the inner most tab.
Now my problem is that while clicking on the Right Horizontal scroll
button It will work fine for 12 tab. (i.e It will scroll up to 12 tab
correctly),But after 12th tab it is not scrolling properly.
Can any one help me out of this.

Thanks in advance

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