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There is no such thing a UIToolBarController in the SDK. If you're using the 1.1.4 toolchain, you'll be hard pressed to find help with that here.
Perhaps you mean UITabBarController? Its been renamed for a long time now, so you may want to update your SDK to Beta 7 if you haven't already.
If it is a UITabBar, then I can't imagine it would look very clean with 10 items in it, though it definitely supports more than 4.