I'm getting a bit confused with navigation bars and toolbars when migrating from iPhone to iPad, since toolbars in iPad seem to be moved to the top, as described in [iOS Human Interface Guidelines](http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/UEBestPractices/UEBestPractices.html#//apple_ref/doc/uid/TP40006556-CH20-SW33), so I'm not clear about the difference between navigation bars and toolbars in iPad devices. I have doubts about them and the buttons and controls that can be displayed in each case, and I don`t find any example that solves them:

**1)**
Is it possible to "mix" a navigation bar and a toolbar, and display back buttons and toolbar items at the same time? For instance, I found that Mail app has toolbar items on the right side of its split view, and a navigation bar with back button in the left side of the split view, so back buttons and toolbar items are always in separated bars in this app:

![Mail](https://i.stack.imgur.com/0N4AF.jpg)

Similarly, Settings app displays a navigation bar with back buttons in the right side of the split view but no toolbar items:

![Settings](https://i.stack.imgur.com/eqsUq.jpg)

Where could I find an example of an app with a bar displaying both navigation back buttons and toolbar items in iPad? Or is it just not possible?

**2)**
Is it possible to display a segmented control in a navigation bar with a title, instead of being in a toolbar without title like this? (iOS Human Interface Guidelines document says it is a toolbar):

![Segmented](https://i.stack.imgur.com/Sr9ub.jpg)

**3)**
Let's say I have a split view similar to Settings app. Is it valid, or correct, to display a toolbar on the right side sometimes, and a navigation bar another times? Or should I always display the same type of bar througout the app?

Thanks