[DllImport("user32.dll")]
        static extern IntPtr WindowFromPoint(POINT Point);

        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int X;
            public int Y;

            public POINT(int x, int y)
            {
                this.X = x;
                this.Y = y;
            }

            public static implicit operator System.Drawing.Point(POINT p)
            {
                return new System.Drawing.Point(p.X, p.Y);
            }

            public static implicit operator POINT(System.Drawing.Point p)
            {
                return new POINT(p.X, p.Y);
            }
        }

        public static bool IsControlVisibleToUser(this Control control)
        {
            var pos = control.PointToScreen(control.Location);
            var pointsToCheck = new POINT[]
                                {
                                    pos,
                                    new Point(pos.X + control.Width - 1, pos.Y),
                                    new Point(pos.X, pos.Y + control.Height - 1),
                                    new Point(pos.X + control.Width - 1, pos.Y + control.Height - 1),
                                    new Point(pos.X + control.Width/2, pos.Y + control.Height/2)
                                };

            foreach (var p in pointsToCheck)
            {
                var hwnd = WindowFromPoint(p);
                var other = Control.FromChildHandle(hwnd);
                if (other == null)
                    continue;

                if (control == other || control.Contains(other))
                    return true;
            }

            return false;
        }