private static extern int SendMessage(IntPtr hWnd, HeaderMessageCodes uMsg, IntPtr wParam, ref HDHITTESTINFO lParam);
private static extern int SendMessage(IntPtr hWnd, HeaderMessageCodes uMsg, IntPtr wParam, ref HDHITTESTINFO lParam);
private static extern int SendMessage(IntPtr hWnd, HeaderMessageCodes uMsg, IntPtr wParam, ref HDHITTESTINFO lParam);
private static extern int SendMessage(IntPtr hWnd, HeaderMessageCodes uMsg, IntPtr wParam, ref HDHITTESTINFO lParam);