Drawing a horizontal line on the main chart

Drawing a horizontal line on a chart

I'm using the below code to draw lines on the chart. The code has no pointed errors, but instead of plotting the lines on the main chart, it plots below the chart on a new chart area. How can I create this lines on the main chart ? I've tried most of the codes in the forum and still didn't work for me:

[Parameter(DefaultValue = 100)]
        public int StepPips { get; set; }

        [Parameter("Cor da linhas", DefaultValue = "White")]
        public string corLinha { get; set; }

        protected override void Initialize()
        {
            double max = Bars.HighPrices.Maximum(Bars.HighPrices.Count);
            double min = Bars.LowPrices.Minimum(Bars.LowPrices.Count);

            double step = Symbol.PipSize * StepPips;
            double start = Math.Floor(min / step) * step;

            Color colorLine = GetColor();
            //ChartArea chrLine = null;
            for (double level = start; level <= max + step; level += step)
            {

                Chart.DrawHorizontalLine("line_" + level, level, colorLine, 1, LineStyle.LinesDots);
            }


        }

Thanks for help