For a typical plot, we can normally do something like this to set a style:
Plots[0].PlotStyle = PlotStyle.HLine;
Plots[0].DashStyleHelper = DashStyleHelper.Dash;
var aaa = Draw.Line(this, _lineTag + "L1", false, BarsArray[0].GetTime(CurrentBar), L1[0], BarsArray[0].GetTime(CurrentBar).AddHours(8), L1[0], Plots[0].Brush, Plots[0].DashStyleHelper, 1); aaa.Stroke.DashStyleHelper = DashStyleHelper.Dash;

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