You can use Mighty Mouse's scroll wheel for navigating around web pages, graphics, and documents that have scroll bars (when content is outside the visible window). However, the scroll wheel doesn't scroll within application menus or menu bar extras' menus. Menu bar extras are the icons that you see in the upper right corner of your Mac OS X desktop--such as volume control, the clock, AirPort, Bluetooth, or the Displays menu.
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Simply move your Mighty Mouse up or down after clicking a menu to navigate within in, then click again when you've highlighted your choice.
Tip: If you can't scroll with Mighty Mouse in any menu or document but you want to, make sure you haven't disabled scrolling.