Create a custom skinclass, inside that skin you add the following states:
<s:states>
<s:State name="normal" />
<s:State name="disabled" />
<s:State name="inactive" />
</s:states>
Once that is done, you have two buttons: TRACK and THUMB. Add this:
<!--- The default skin class is VScrollBarTrackSkin.
@copy spark.components.supportClasses.TrackBase#track
@see spark.skins.spark.VScrollBarTrackSkin -->
<s:Button id="track" top="0" bottom="0" height="54"
focusEnabled="false"
skinClass="com.happymetrix.client.mobile.components.uiLegacy.scroller.dark.DarkVScrollerTrackSkin"/>
<!--- The default skin class is VScrollBarThumbSkin.
@copy spark.components.supportClasses.TrackBase#thumb
@see spark.skins.spark.VScrollBarThumbSkin -->
<s:Button id="thumb"
focusEnabled="false" visible.inactive="false"
skinClass="com.happymetrix.client.mobile.components.uiLegacy.scroller.dark.DarkVScrollerThumbSkin" />
visible.inactive = "false"; Just try to play a bit with the custom skinclasses.