ulReserved (ULONG)

      Reserved.

    ulReserved (ULONG)

      Reserved.

    rc (ULONG)

      Return codes indicating the state of the graphic button.

      GB_UP

        The graphic button is in the Up state.
      GB_DOWN
        The graphic button is in the Down state.
      GB_HILITE
        The graphic button is in the highlighted state.
      GB_ERROR
        An error has occurred.

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