Acquiring color properties from custom dialog

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C#

I am creating a custom dialog that would modify the background and foreground of a control. This ColorPicker is set as "FixedDialog" mode. This custom dialog enables me to adjust the background with foreground then set richtextbox colors on the main app.

I may be missing something... I kept on getting R: 240, G: 240, B: 240.

What I have tried:

From the calling application:

ColorPicker cp = new ColorPicker();

richtextbox2.BackColor = cp.BackColor;

in the custom dialog: the code looks like this:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TerminalWindows
{
    public partial class ColorPicker : Form
    {
        public Color Color_Background { get; set; }
        public Color Color_Foreground { get; set; }

        int red = 0;
        int blue = 0;
        int green = 0;
        int brightness;

        public ColorPicker()
        {
            InitializeComponent();

            btn_01.Click += ColorButtonClick;
            btn_02.Click += ColorButtonClick;
            btn_04.Click += ColorButtonClick;
            btn_05.Click += ColorButtonClick;
            btn_06.Click += ColorButtonClick;
            btn_07.Click += ColorButtonClick;
            btn_08.Click += ColorButtonClick;
            btn_09.Click += ColorButtonClick;
            btn_10.Click += ColorButtonClick;
            btn_11.Click += ColorButtonClick;
            btn_12.Click += ColorButtonClick;
            btn_13.Click += ColorButtonClick;
            btn_14.Click += ColorButtonClick;
            btn_15.Click += ColorButtonClick;
            btn_16.Click += ColorButtonClick;
            trackbar_Blue.ValueChanged += TrackbarColorUpdate;
            trackbar_Red.ValueChanged += TrackbarColorUpdate;
            trackbar_Green.ValueChanged += TrackbarColorUpdate;
            trackbar_Brightness.ValueChanged += TrackbarColorUpdate;
            lbl_ColorResult.ForeColor = Color_Foreground;
            lbl_ColorResult.BackColor = Color_Background;
            ChangeTrackbarValue(BackColor);
        }

        private void Btn_01_MouseClick1(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

        private void Btn_01_MouseClick(object sender, MouseEventArgs e)
        {
            throw new NotImplementedException();
        }

        private void ReverseColor(object sender, EventArgs e)
        {
            lbl_ColorResult.BackColor = Color.FromArgb(lbl_ColorResult.BackColor.ToArgb() ^ 0xffffff);
            lbl_ColorResult.ForeColor = Color.FromArgb(lbl_ColorResult.ForeColor.ToArgb() ^ 0xffffff);

            if (rb_Background.Checked)
                ChangeTrackbarValue(lbl_ColorResult.BackColor);
            else
                ChangeTrackbarValue(lbl_ColorResult.ForeColor);
        }

        private void rb_Background_CheckedChanged(object sender, EventArgs e)
        {
            if (rb_Background.Checked)
            {
                ChangeTrackbarValue(Color_Background);
            }
        }

        private void rb_Foreground_CheckedChanged(object sender, EventArgs e)
        {
            if (rb_Foreground.Checked)
            {
                ChangeTrackbarValue(Color_Foreground);
            }
            
        }

        private void ColorButtonClick(object sender, EventArgs e)
        {
            var button = sender as Button;

            ChangeTrackbarValue(button.BackColor);
        }

        private void UpdateColors()
        {
            
            red = trackbar_Red.Value;
            green = trackbar_Green.Value;
            blue = trackbar_Blue.Value;
            brightness = trackbar_Brightness.Value;
            lbl_Blue.Text = blue.ToString();
            lbl_Red.Text = red.ToString();
            lbl_Brightness.Text = brightness.ToString();
            lbl_Green.Text = green.ToString();

            if (rb_Background.Checked)
                lbl_ColorResult.BackColor = Color.FromArgb(red, green, blue);
            else if (rb_Foreground.Checked)
                lbl_ColorResult.ForeColor = Color.FromArgb(red, green, blue);
            
            Color_Background = lbl_ColorResult.BackColor;
            Color_Foreground = lbl_ColorResult.ForeColor;
        }

        private void TrackbarColorUpdate(object sender, EventArgs e)
        {
            UpdateColors();
        }

        private void ChangeTrackbarValue(Color color)
        {
            trackbar_Green.Value = color.G;
            trackbar_Red.Value = color.R;
            trackbar_Blue.Value = color.B;
        }

        private void btn_OK_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Good bye");
        }
    }
}