internal NMTTDISPINFO(int flags)
 {
     this.hdr = new NMHDR(0);
     this.lpszText = IntPtr.Zero;
     this.szText = IntPtr.Zero;
     this.hinst = IntPtr.Zero;
     this.uFlags = 0;
     this.lParam = IntPtr.Zero;
 }
 public static extern int SendMessage(
     IntPtr hWnd, int msg, IntPtr wParam, ref NMHDR lParam);
 public static extern int RtlMoveMemory(
     ref NMHDR destination, IntPtr source, int length);