usStart (USHORT)

      Start/stop animation.

      TRUE

        Start animating the graphic button.
      FALSE
        Stop animating the graphic button.

      usContinue (USHORT)

        Starting point of animation.

        TRUE

          Animation starts with the currently shown bitmap. For example, if the graphic button is in the Down state, the animation begins with the Down bitmap and continues with subsequent bitmaps in the array until the end of the animation series. Then, the animation restarts at the beginning of the animation series (but not necessarily with the Down bitmap).
        FALSE
          Animation starts at the beginning of the animation bitmap series. The start of this series can be specified by a GBM_SETBITMAPINDEX message.

        rc (ULONG)

          Return codes indicating success or failure.

          TRUE

            Success.
          FALSE
            Failure or not recognized.

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