I want to add a button that is attached to the particular part of the screen. It means that when I scroll my TableView, the position of this button on the screen doesn't change. I want my screen to look exactly like [this](http://i-fotki.info/22/997a29bde5055612606901fc0399922605e47d284086353.jpg.html) or [this](http://i-fotki.info/22/95ef33a21ab3b71fd1f2cbd7a17a6e3505e47d284086353.jpg.html) app.

I would be grateful for any help. Thank you!