ATR Switch with button

Hi,

I created an indicator that should show the selected ATR SL value on the chart, with a button that should switch the type between buy and sell.

However, I am having problems getting the button to work, both in function and chart placement. 
Any advice would be appreciated.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo
{
    [Indicator(IsOverlay = true, AccessRights = AccessRights.None)]
    public class ATRSLValue : Indicator
    {
        [Parameter("Period", Group = "ATR", DefaultValue = 14, MinValue = 1)]
        public int PeriodATR { get; set; }

        [Parameter("MA Type", Group = "ATR", DefaultValue = MovingAverageType.Simple)]
        public MovingAverageType MAtypeATR { get; set; }

        [Parameter("Multiplier", Group = "ATR", DefaultValue = 1.0, MinValue = 0.1, Step = 0.1)]
        public double MultiplierATR { get; set; }

        AverageTrueRange _atr;
        double CalculatedResult;
        bool SellOrBuy;
        Button button;

        [Output("Main Up", LineColor = "Green", Thickness = 2)]
        public IndicatorDataSeries ResultUp { get; set; }
        
        [Output("Main Down", LineColor = "Red", Thickness = 2)]
        public IndicatorDataSeries ResultDown { get; set; }

        protected override void Initialize()
        {
            _atr = Indicators.AverageTrueRange(PeriodATR, MAtypeATR);
            button = new Button();
            button.BackgroundColor = Color.Green;
            button.Text = "SWITCH TO SELL";
            button.Margin = 300;
            button.HorizontalAlignment = HorizontalAlignment.Right;
            button.VerticalAlignment = VerticalAlignment.Bottom;
            button.IsVisible = true;
            button.IsEnabled = true;
            SellOrBuy = false;
            
            Chart.AddControl(button);
        }

        public override void Calculate(int index)
        {
            button.Click += args => SwitchType();
            
            CalculatedResult = _atr.Result.LastValue * MultiplierATR;
            
            if (SellOrBuy)
            {
                button.BackgroundColor = Color.Green;
                button.Text = "SWITCH TO SELL";
                ResultUp[index] = Bars.ClosePrices.LastValue - CalculatedResult;
            }
            
            if (!SellOrBuy)
            {
                button.BackgroundColor = Color.OrangeRed;
                button.Text = "SWITCH TO BUY";
                ResultDown[index] = Bars.ClosePrices.LastValue + CalculatedResult;
            }
        }

        private void SwitchType()
        {
            if (SellOrBuy)
            {
                SellOrBuy = false;
            }

            if (!SellOrBuy)
            {
                SellOrBuy = true;
            }
        }
    }
}