Message Only Window C#

MessageOnlyWindow.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace MyAPI
{
    // Message Only Window
    class MessageOnlyWindow : Form
    {
        public List<Event> events = null;

        [DllImport("user32.dll")]
        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        public MessageOnlyWindow()
        {
            var accessHandle = this.Handle;
        }

        public void setListCallbacksAndInit(List<Event> callbacks)
        {
            this.events = callbacks;
        }

        protected override void OnHandleCreated(EventArgs e)
        {
            base.OnHandleCreated(e);
            ChangeToMessageOnlyWindow();
        }

        private void ChangeToMessageOnlyWindow()
        {
            IntPtr HWND_MESSAGE = new IntPtr(-3);
            SetParent(this.Handle, HWND_MESSAGE);
        }
        
        // Override
        protected override void WndProc(ref Message m)
        {
            MyAPI.ProcessWindowsMessage(ref m); // Could pass events list here as well
            base.WndProc(ref m);
        }
    }
}