Add destiny to [output directive to enable overriding the standard output choosen in the indicator.

  [Output("Price", IsOverlay = false, LineColor = "white",  LineStyle=LineStyle.Dots)]
  public IndicatorDataSeries ExpectedPrice { get; set; }

this will enable you to draw a dataserie on the Chart when also using the indicator window.

This is much easier than drawing trendlines for every point to point data.