HWND pascal SetParent(HWND hWnd, HWND hNewParent)
 <MS-WINDOWS equivalent>

  This function changes the parent of the specified window.

Parameters
  hWnd is the handle of the window which you want to relink to a new
   parent. It can also be NULLHWND if you want to remove a parent link
   from a window.
  hNewParent is the handle of the new parent window.

Returns
  The handle of the old parent, or NULLHWND if it had no parent previously.