How can I create scrolling areas like the ones on stackoverflow?

I'm currently working on a flash project, which will use multiple scroll areas. I'm trying to find out how to create a scroll area like I see on stackoverflow, and make it function similarly. Whenever someone posts their lines of code to stackoverflow, the sc开发者_如何学Goroll area scrollbar looks exactly like the scrollbar in the web browser, and is able to be scrolled with the mousewheel smoothly, without affecting the webpage scrolling.

Example: disable mouse wheel scrolling while cursor over flex app?

Could anyone please explain to me how I can do this in my flash project? Thanks!!

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You wouldn't need flash to do this... This is accomplished using CSS. You would just need to put the portion you wanted to function like that in a div (or any HTML container for that matter) and then define such properties as min-height, max-height, min-width, max-width, overflow, etc. I think there's one that determines the presence of the scroll bars but I don't remember what it is for sure. Very easy to do this and flash would be a bit of overkill.