Setting the MailComposer's toolbar style

How is the MFMailComposeViewController's top bar's style set?

Is this a navigation bar?

I read the docs and cant s开发者_如何学编程eem to find how to set this.

---

It's not possible unfortunately:

Important: The mail composition interface itself is not customizable and must not be modified by your application. In addition, after presenting the interface, your application is not allowed to make further changes to the email content. The user may still edit the content using the interface, but programmatic changes are ignored. Thus, you must set the values of content fields before presenting the interface.

From http://developer.apple.com/library/ios/#documentation/MessageUI/Reference/MFMailComposeViewController_class/Reference/Reference.html