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    Type:New Feature 
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    Resolution: Done
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    Priority:Normal 
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    Affects Version/s: 6.0.1
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    Component/s: Components
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        None
Right now there is no choice: the tabs either appear at the top (when orient=horizontal) or on the left (when orient=vertical). Some people have an interest in customizing this: http://www.zkoss.org/forum/listComment/4503