Resources of Launchpad

I love the design of Launchpad so much and decided to use the "sliding" effect of the Launchpad folder (when clicked) in my project.

So I need the graphic resources of that.

I know the background PNG file is in the CoreServices>>Dock.app.

But, where could I get the triangle and 1-pixel border?


I really hope Mac gurus in MacRumors could help me on this very important problem.

Without your advice, my project can't be alive.

Thank you very much.