Feature Suggestion

Feature description: Avoid the readonly modifier in Crosshair public members HLine and VLine, to make them consistent with plottables HLine and VLine.

As shown in #2007, this is actually possible, resulting in lines which are directily user-draggable:

        VLine1 = formsPlot1.Plot.AddVerticalLine(23, Color.Blue);
        VLine1.DragEnabled = true;

        HLine1 = formsPlot1.Plot.AddHorizontalLine(.2, Color.Green);
        HLine1.DragEnabled = true;

However, trying the same with plottable Crosshair doesn't seem to work:

           var crossHair = this.formsPlot1.Plot.AddCrosshair(0, 0);
           crossHair.VerticalLine.DragEnabled = true;
           crossHair.HorizontalLine.DragEnabled = true;    // still, both vertical and horizontal lines can't be user-dragged after this

It seems that plottable Crosshair lines are readonly, preventing them to be modified (i.e. modifying their DragEnable property):

And plottables VLine and HLine are just public, so there's no problem modifying the DragEnable property:

I don't know what are the reasons for that, but it could be a nice modification in order to make it possible for someone to implement snapping for Crosshair as suggested in #2007 and implemented in #2008 and #2017.