code for displaying the picker view down wards when we click the button,and the relavent page must be displayed down words

Question

Hi am new to iphone can any body help me,in my ipad app first i have to add 2 r 3 buttons on the top of app,then when I click the button the list of of buttons under that must be displayed down ,if I select any button in that list the action of that button must happen in the bottom of page.