THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- ITab.getPanel() now returns WebMarkupContainerWithAssociatedMarkup WebMarkupContainer instead of Panel so it is now possible to create tabs using Fragments or Panels rather then just Panels.
- TabbedPanel.setSelectedTab() is now chainable
- TabbedPanel now takes a List<? extends ITab> rather then List<ITab>
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