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We do not provide any other scrolling controls than the native ones. And the only way to change the appearance is by using CSS. And the only browsers/rendering engines that support scrollbar styling are Internet Explorer (since version, what, 5?) and WebKit (since last March).
If you definitely need custom styled scrollbars, you need to build your own component for that, unfortunately. Existing solutions (built with GWT, jQuery or such) can be imported quite easily.