id (USHORT)

      Control-window identity.

    usnotifycode (USHORT)

      Notify code.

      The list box control window procedure uses these notification codes:

      LN_ENTER

        Either the Enter or Return key has been pressed while the list box control has the focus, or the list box control has been double-clicked.
      LN_KILLFOCUS
        The list box control loses the focus.
      LN_SCROLL
        The list box control is about to scroll horizontally. This can happen when the application has issued a WinScrollWindow function.
      LN_SETFOCUS
        The list box control receives the focus.
      LN_SELECT
        An item is being selected (or deselected).

        Note: To discover the index of the selected item, the application must use the LM_QUERYSELECTION message.

      hwndcontrolspec (HWND)

        List box control window handle.

      ulReserved (ULONG)

        Reserved value, should be 0.

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