It’s still not clear what you want, but I’ll try to answer below:
If you want to Style the Scrollbar
e.g. change the width of the scrollbar grips, or height of scrollbar, or the visual appearance of the scrollbar, please see SciChartScrollbar – per axis ScrollBars API and scroll down to Styling the SciChartScrollBar
If you want to programmatically change the position of the scrollbar
Simply set SciChartSurface.XAxis.VisibleRange = new DoubleRange(min, max)
assuming you have a NumericAxis on the XAxis. The Scrollbar Selected range is bound to the axis visible range.
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