How do I get / retrieve all open charts?

I am trying to copy the lines I draw using the code below onto all other open charts. I am not exactly sure how to do it. Here is what I am thinking off:

I should iterate through the list of open charts and use the ChartObjects.DrawLine() method to draw the lines onto each chart.

I am not exactly sure how to retrieve all charts. I looked through the reference section and under charts, there aren't any methods that can be used to retrieve all charts. Can anyone make a suggestion on how I could tackle this problem? 



using System;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class MyRobot : Robot
    {
        [Parameter("X", DefaultValue = 10)]
        public int X { get; set; }

        private string line1Name = "line1";
        private string line2Name = "line2";

        protected override void OnStart()
        {
            // Get the previous candle 
            var previousCandleClose = Bars.ClosePrices.Last(1);
            var previousCandleOpen = Bars.OpenPrices.Last(1);

            // If the previous candle close is higher than the previous candle open
            if (previousCandleClose > previousCandleOpen)
            {
                // Draw a horizontal line at the previous candle close + X * 2
                Chart.DrawHorizontalLine(line1Name, previousCandleClose + X, Color.Yellow, 2, LineStyle.Solid);

                // Draw a horizontal line at the previous candle open - X * 2
                Chart.DrawHorizontalLine(line2Name, previousCandleOpen - X, Color.Yellow, 2, LineStyle.Solid);
            }
            else
            {
                // Draw a horizontal line at the previous candle close - X * 2
                Chart.DrawHorizontalLine(line1Name, previousCandleClose - X, Color.Yellow, 2, LineStyle.Solid);

                // Draw a horizontal line at the previous candle open + X * 2
                Chart.DrawHorizontalLine(line2Name, previousCandleOpen + X, Color.Yellow, 2, LineStyle.Solid);
            }
        }

        protected override void OnBar()
        {
            // Get the previous candle 
            var previousCandleClose = Bars.ClosePrices.Last(1);
            var previousCandleOpen = Bars.OpenPrices.Last(1);

            // Remove the previous lines
            Chart.RemoveObject(line1Name);
            Chart.RemoveObject(line2Name);

            // If the previous candle close is higher than the previous candle open
            if (previousCandleClose > previousCandleOpen)
            {
                // Draw a horizontal line at the previous candle close + X * 2
                Chart.DrawHorizontalLine(line1Name, previousCandleClose + X, Color.Yellow, 2, LineStyle.Solid);

                // Draw a horizontal line at the previous candle open - X * 2
                Chart.DrawHorizontalLine(line2Name, previousCandleOpen - X, Color.Yellow, 2, LineStyle.Solid);
            }
            else
            {
                // Draw a horizontal line at the previous candle close - X * 2
                Chart.DrawHorizontalLine(line1Name, previousCandleClose - X, Color.Yellow, 2, LineStyle.Solid);

                // Draw a horizontal line at the previous candle open + X * 2
                Chart.DrawHorizontalLine(line2Name, previousCandleOpen + X, Color.Yellow, 2, LineStyle.Solid);
            }
        }
    }
}