Nimbus LAF : JTabbedPane dn't wrap tab policy scrollpane arrow buttons is missing

When a Tabbed pane is set to 'Wrap Tab Policy' it is suppose to show a arrow button which are used to navigate to tabs. but now in Nimbus LAF the arrow buttons are missing.
Step to reproduce:
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1) Run the attached program.
2) Click on 'Wrap Tab Policy' checkbox . Observe that tabs are arranged in row, honoring the 'Wrap tab policy' but the arrow button are missing.
But we can navigate through the keyboard from tab to tab using arrow key.
This can be seen on OS only in Nimbus LAF.