Problems with .AddChild and .RemoveChild after update

Hi,

After the last update (version 4.8.15.18913) the .AddChild and .RemoveChild stopped working.

I have a combobox with an extensive list of options, by choosing, it creates grids with texbox, textblock, checkbox, etc ... and removes all grids created previously. 
Interesting, my combobox has LocalStorage, if I restart the indicator, it starts with the controls properly created, it loads everything correctly.

Here is a code example, it should work, but it ignores the creation and removal childs. But in the Log it does the Print().

Thanks in advance!
 

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(AccessRights = AccessRights.None)]
    public class Test : Indicator
    {
        private ComboBox myDropList;
        private Grid myDropListGrid, gridItemA, gridItemB, gridItemC;
        private string selectedValue;
        private TextBlock lblTextA, lblTextB, lblTextC;
        private bool lockGridExecuteA, lockGridExecuteB, lockGridExecuteC;

        protected override void Initialize()
        {
            selectedValue = null;
            lockGridExecuteA = false;
            lockGridExecuteB = false;
            lockGridExecuteC = false;
            
            myDropListGrid = new Grid(2, 1)
            {
                Width = 100,
                Height = 100,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
                ShowGridLines = true
            };
        
            myDropList = new ComboBox
            {   
                Width = 100,
                Height = 20,
                HorizontalContentAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center
            };
            
            myDropList.AddItem("A");
            myDropList.AddItem("B");
            myDropList.AddItem("C");
            
            myDropList.SelectedItemChanged += myDropList_SelectedIndexChanged;
            
            Border myDropListBorder = new Border()
            {
                Child = myDropList,
            };
            
            myDropListGrid.AddChild(myDropListBorder, 0, 0);
            
            Chart.AddControl(myDropListGrid);
        }
        
        private void myDropList_SelectedIndexChanged(ComboBoxSelectedItemChangedEventArgs obj)
        {
            if (myDropList.SelectedIndex >= 0)
            {
                selectedValue = myDropList.SelectedItem.ToString();

                switch (selectedValue)
                {
                    case "A":
                        RemoveIndicatorGrids();
                        ExecuteA();
                        break;
                    case "B":
                        RemoveIndicatorGrids();
                        ExecuteB();
                        break;
                   case "C":
                        RemoveIndicatorGrids();
                        ExecuteC();
                        break;
                }
            }
        }
        
        private void ExecuteA()
        {
            if(!lockGridExecuteA)
            {
                gridItemA = new Grid(1, 1);
                myDropListGrid.AddChild(gridItemA, 1, 0);
                
                lblTextA = CreateLabel("Item A");
                Print("Item A created");
                
                gridItemA.AddChild(lblTextA, 0, 0);
                
                lockGridExecuteA = true;
            }            
        }
        
        private void ExecuteB()
        {
            if(!lockGridExecuteB)
            {
                gridItemB = new Grid(1, 1);
                myDropListGrid.AddChild(gridItemB, 1, 0);
                
                lblTextB = CreateLabel("Item B");
                Print("Item B created");
                
                gridItemB.AddChild(lblTextB, 0, 0);
                
                lockGridExecuteB = true;
            }
        }
        
        private void ExecuteC()
        {
            if(!lockGridExecuteC)
            {
                gridItemC = new Grid(1, 1);
                myDropListGrid.AddChild(gridItemC, 1, 0);
                
                lblTextC = CreateLabel("Item C");
                Print("Item C created");
                
                gridItemC.AddChild(lblTextC, 0, 0);
                
                lockGridExecuteC = true;
            }
        }
        
        private void RemoveIndicatorGrids()
        {
            if (selectedValue != null)
            {
                if (selectedValue != "A" && lockGridExecuteA)
                {
                    myDropListGrid.RemoveChild(gridItemA);
                    Print("Remove gridItemA");
                    lockGridExecuteA = false;
                }
                
                if (selectedValue != "B" && lockGridExecuteB)
                {
                    myDropListGrid.RemoveChild(gridItemB);
                    Print("Remove gridItemB");
                    lockGridExecuteB = false;
                }
                
                if (selectedValue != "C" && lockGridExecuteC)
                {
                    myDropListGrid.RemoveChild(gridItemC);
                    Print("Remove gridItemC");
                    lockGridExecuteC = false;
                }
             }
        }
        
        private TextBlock CreateLabel(string text)
        {
            return new TextBlock
            {
                Text = text,
                TextAlignment = TextAlignment.Center,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
                ForegroundColor = Color.Red,
                FontSize = 12
            };
        }

        public override void Calculate(int index)
        {
            //...
        }
    }
}