System.Windows.Forms.CommandBarManager.WndProc C# (CSharp) Method

        protected override void WndProc(ref Message message)
        {
            base.WndProc(ref message);

            switch (message.Msg)
            {
                case NativeMethods.WM_NOTIFY:
                case NativeMethods.WM_NOTIFY + NativeMethods.WM_REFLECT:
                {
                    NativeMethods.NMHDR note = (NativeMethods.NMHDR)message.GetLParam(typeof(NativeMethods.NMHDR));
                    switch (note.code)
                    {
                        case NativeMethods.RBN_HEIGHTCHANGE:
                            this.UpdateSize();
                            break;

                        case NativeMethods.RBN_CHEVRONPUSHED:
                            this.NotifyChevronPushed(ref message);
                            break;
                    }
                }
                    break;
            }
        }