GBM_SETBITMAPINDEX Field - usGBState

usGBState (USHORT)

State of graphic button whose index is to be changed.

GB_UP

Set the bitmap used when in the Up state.
GB_DOWN
Set the bitmap used when in the Down state.
GB_HILITE
Set the bitmap used when in the highlighted state.
GB_DISABLE
Set the bitmap used when in the disabled state.
GB_ANIMATIONBEGIN
Where animation must begin.
GB_ANIMATIONEND
Where animation must end.
GB_CURRENTSTATE
Refers to either up or down bitmaps; depends on whether the button is in the Up or Down state.

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