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Using styles with the UIScrollBar component
The UIScrollBar component supports the following styles:

Style
Theme
Description

themeColor
Halo
The base color scheme of a component. Possible values are "haloGreen", "haloBlue", and "haloOrange". The default value is "haloGreen".

scrollTrackColor
Sample
The background color for the scroll track.The default value is 0xCCCCCC (light gray).

symbolColor
Sample
The color of the up and down scroll arrows. The default value is 0x000000 (black).

symbolDisabledColor
Sample
The color of the up and down scroll arrows in a disabled scroll bar. The default value is 0x848384 (dark gray).
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perchè se scrivo

barra.setStyle("symbolDisabledColor","0xff0000");

oppure

_global.style.setStyle("symbolDisabledColor","0xff 0000");

non cambia nulla?!?!?!?!