Pick recipients like MFMailComposeViewController does?

MFMailCo开发者_StackOverflowmposeViewController has this cool way of adding recipients. Either by picking from the address book or by autocompleting whatever the user types. Then the selected address is converted into this blue button-like thing. Backspacing deletes the blue thing/the address.

I would like to have exactly this way of recipients in my application to select some users. Does anybody know of an implementation with source available? Or has somebody a clear idea how Apple implemented it?

René

If you find yourself capable in translation objective-c to C# then you could always look at the Three20 library. They have implemented it in their TT Message Controller.