i want use from mouse enter event for my user control

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 Test_UserControl
{
    public partial class Form1 : Form
    {
        MyCtl ctl = new MyCtl();
        Color ctlDefaultColor;

        public Form1()
        {
            InitializeComponent();
            InitOthers();
        }

        private void InitOthers()
        {
            this.SuspendLayout();
            // set ctl properties
            this.ctl.Left = 10;
            this.ctl.Top = 10;
            this.Controls.Add(ctl);
            this.ctl.MouseEnter += ctl_MouseEnter;
            this.ctl.MouseLeave += ctl_MouseLeave;

            this.ctlDefaultColor = this.ctl.ForeColor;
            this.ResumeLayout(false);
            this.PerformLayout();
        }

        void ctl_MouseLeave(object sender, EventArgs e)
        {
            // restore backcolor
            this.ctl.ForeColor = this.ctlDefaultColor;
        }

        void ctl_MouseEnter(object sender, EventArgs e)
        {
            // set backcolor
            this.ctl.ForeColor = Color.Yellow;
        }
    }

    public class MyCtl : UserControl
    {
        Label lbl;
        Button btn;

        public MyCtl()
        {
            this.Initialize();
        }
        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
        }
        private void Initialize()
        {
            this.SuspendLayout();
            this.lbl = new Label();
            this.lbl.Left = 10;
            this.lbl.Top = 10;
            this.lbl.Text = "There exists a label here";
            this.Controls.Add(this.lbl);

            this.btn = new Button();
            this.btn.Left = 10;
            this.btn.Top += this.lbl.Bottom + 10;
            this.btn.Text = "My Button";
            this.Controls.Add(this.btn);

            this.ResumeLayout(false);
        }
        
    }
}