DownBrushDX

protected override void OnRender(ChartControl chartControl, ChartScale chartScale, ChartBars chartBars)
{
   for (int idx = chartBars.FromIndex; idx <= chartBars.ToIndex; idx++)
       {
           double     closeValue             = bars.GetClose(idx); 
           double     openValue               = bars.GetOpen(idx);
 
           // Set the brush of the current candle to UpBrushDX or DownBrushDX, depending on the 
           // bar direction
           Brush brush = closeValue >= openValue ? UpBrushDX : DownBrushDX;
       }
}