Scroller is locked?!?

I made my scrollpane border white with this script:

_global.styles.ScrollPane = new mx.styles.CSSStyleDeclaration();
_global.styles.ScrollPane.setStyle(“borderStyle”,“solid”);
_global.styles.ScrollPane.setStyle(“borderColor”,“0xffffff”);

But after written it, i couldn’t scroll. The scroller is locked?!! Can someone hel me with unlocking it??