User interface like iPhone home screen......

Hi,I am working on a user interface in that there are number of buttons (options) on a toolbar. On each button click another window/screen is opened. I want to modify my main screen and make it something like iphone home screen or like Safari's "Top Sites" view. I mean instead of showing all the options as toolbar buttons l want all the options to be placed as a tile or thumbnail on main screen.Can anybody suggest how can i achieve this in my Cocoa application.Thanks & RegardsAbhijeet