myScrollBar.setStyleProperty(styleProperty , value )

codice:
myScrollBar.setStyleProperty("arrow", 0xFF0000); 
myScrollBar.setStyleProperty("highlight", 0xFFFFFF); 
myScrollBar.setStyleProperty("highlight3D", 0xFF0000); 
myScrollBar.setStyleProperty("shadow", 0xFF99CC); 
myScrollBar.setStyleProperty("darkshadow", 0xFF0000); 
myScrollBar.setStyleProperty("scrollTrack", 0xCC6666); 
myScrollBar.setStyleProperty("face", 0xFFCCCC);