Flash scrolls edition

How can I modify the scrolls in Flash MX…it comes defines in certain ways…but if i want to change the arrows form? the color?? how do you apply skins to scrolls??

When you put you’re scrollbar on the scene. You will find in your library a Flash UI Components map. When you open that map you must open another map called flash component skins(another map follow open it too). When you open that map you will know what the do.

Do you know what’s the use of registering skin elements in the read me layer of a component?
I tried to change the appereance of a scrollbar inserting new mc (a new arrow) but I didn’t understand what’s the differennce between registering and simply adding a new mc.

Thanks if someone can explain me.