id (USHORT)

      Container control ID.

    CN_EXPANDTREE (USHORT)

      Notification code.

    pRecord (PRECORDCORE)

      Pointer to the record that was expanded.

      Note: If the CCS_MINIRECORDCORE style bit is specified when a container is created, then MINIRECORDCORE should be used instead of RECORDCORE and PMINIRECORDCORE should be used instead of PRECORDCORE in all applicable data structures and messages.

    ulReserved (ULONG)

      Reserved value, should be 0.

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