I think that the implementation of what you are describing should not be a problem in the app store, unless your implementation is confused and does not “break” the standard behavior on the tab. In other words, if it looks like or looks like a standard Apple control, it should function in a very similar way and not act “broken” for a user who is familiar with tabs. Apple really gives you freedom of action and creativity with user interface controls if you are a little careful not to confuse or annoy the user.
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http://mattgemmell.com/2010/07/31/mgsplitviewcontroller-for-ipad