UIButton drop down animation

hello macrumors

how can animation uibutton in app? (see image)

http://imageshack.us/photo/my-images/853/img0232l.png/

want present text in drop down effect, when button selected.

know how cool effect work?

 

you use uitableview , animate row getting added text when button cell tapped.

or figure out how use animation blocks... ios programming course available through stanford's itunes u page has pretty intro lecture on animation blocks free.

 

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