Trigger lines indicator

Hi, I compiled the code below from the MT4 trigger lines code. The problem I have is that I cannot make the lines colored Lime to disappear when the market goes down or the ones clored Magenta to disappear when the market goes up. Can any one please help (Screen shot attached). Thanks a million.

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

namespace cAlgo.Indicators
{
    [Indicator(IsOverlay = true)]
    public class Triggerlines : Indicator
    {
        [Parameter(DefaultValue = 0.0)]
        public double Parameter { get; set; }
        

       #region indicator line
       
        
        [Output("Up", Color = Colors.Lime)]
        public IndicatorDataSeries UpBuffer { get; set; }
        [Output("UpMa", Color = Colors.Lime)]
        public IndicatorDataSeries UpBuffer_ma { get; set; }

        [Output("Dn", Color = Colors.Magenta)]
        public IndicatorDataSeries DnBuffer { get; set; }
        [Output("Dnma", Color = Colors.Magenta)]
        public IndicatorDataSeries DnBuffer_ma { get; set; }


        #endregion
        private IndicatorDataSeries wt;
        private IndicatorDataSeries lsma_ma;
        private ExponentialMovingAverage _EMA;
        private const int length = 25;
        private const int lsma_length = 13;

        private int shift;
        private int loopbegin;
        private int cnt;
        private int i;
        private double su;
        private double lengthvar;
        private double tmp ;
        
        protected override void Initialize()
        {
            wt = CreateDataSeries();
            lsma_ma = CreateDataSeries();
            _EMA = Indicators.ExponentialMovingAverage(wt, lsma_length);

        }

        public override void Calculate(int index)
        {
            
         /*    DnBuffer[index] = double.NaN;
             DnBuffer_ma[index] = double.NaN;
             UpBuffer[index] = double.NaN;
             UpBuffer_ma[index] = double.NaN;*/

       
            for(cnt = index - 1; cnt <= index; cnt++)
                 { 
                   su = 0;
                   for(i = length; i >= 1 ; i--)
                        {
                           lengthvar = (length + 1);
                           lengthvar /= 3;
                           tmp = 0;
                           tmp = ( i - lengthvar)*MarketSeries.Close[index-length+i];
                           su+=tmp;
                         }
                     wt[cnt] = su*6/(length*(length+1));
                }

     
         lsma_ma[index] =_EMA.Result[index];
                          
//========== COLOR CODING ===========================================                       
        
        
            
            if (wt[index]  < lsma_ma[index] && wt[index-1]  < lsma_ma[index-1])
            {
              DnBuffer[index] = wt[index]; 
              DnBuffer_ma[index] = lsma_ma[index]; 
               UpBuffer[index] = double.NaN;
               UpBuffer_ma[index] = double.NaN;
            }          
            
           if (wt[index]  > lsma_ma[index]&& wt[index-1]  > lsma_ma[index-1])
            {
                UpBuffer[index] = wt[index]; 
                UpBuffer_ma[index] = lsma_ma[index]; 
                DnBuffer[index] = double.NaN;
                DnBuffer_ma[index] = double.NaN;
               
            }  
                  
      }  
    } 
}