usGBState (USHORT)

      Bitmap state.

      GB_UP

        Query bitmap used when in the Up state.
      GB_DOWN
        Query bitmap used when in the Down state.
      GB_HILITE
        Query bitmap used when in the highlighted state.
      GB_DISABLE
        Query bitmap used when in the disabled state.
      GB_ANIMATIONBEGIN
        Query bitmap at the beginning of an animation series.
      GB_ANIMATIONEND
        Query bitmap at the end of an animation series.
      GB_CURRENTSTATE
        Query the index of the currently shown bitmap.
      GB_ERROR
        Invalid parameter.

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