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In Contacts application when you click on "Edit" button on the right side of the navbar, view will dynamically change it self in order to allow user edit various stuff.

Besides other cool animated stuff that is going on, what I am really interested in though is the bottom "Delete Contact" button which appears when in edit mode and disappears when done or cancel is tapped.

How do you implement this kind of stuff? Thanks.

P.S.: related questions http://stackoverflow.com/questions/2658562/create-an-edit-view-similar-to-contacts-app and http://stackoverflow.com/questions/1528677/how-is-iphone-contact-apps-detail-view-implemented won't cut it.