Alsing.Windows.Forms.CoreLib.IntelliMouseControl.WndProc C# (CSharp) Метод

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_MOUSELEAVE)
            {
                base.WndProc(ref m);
                Deactivate();
                return;
            }

            base.WndProc(ref m);
        }
    }