System.Windows.Forms.CommandBar.HitTest C# (CSharp) Method

        private int HitTest(Point point)
        {
            NativeMethods.POINT pt = new NativeMethods.POINT();
            pt.x = point.X;
            pt.y = point.Y;

            int hit = NativeMethods.SendMessage(Handle, NativeMethods.TB_HITTEST, 0, ref pt);
            if (hit > 0)
            {
                point = this.PointToScreen(point);
                Rectangle bounds = this.RectangleToScreen(new Rectangle(0, 0, Width, Height));
                if (!bounds.Contains(point))
                {
                    return -1;
                }
            }

            return hit;
        }