Is it possible to change the color of the rz-bar (or some other way) so that the top of it above the marker is one color, and the bottom of the bar is another color below the other marker? So in the image here, the red circled area of the bar could be styled red, and the highlighted yellow part could be styled yellow. Is this possible? I know the getSelectionBarColor option does the selection bar but doesn't handle the "outer" bar.

Thanks