uscheck (USHORT)

      Check state.

    • Display the button control in the unchecked state
    • Display the button control in the checked state
    • Display a 3-state button control in the indeterminate state.

    ulReserved (ULONG)

      Reserved value, should be 0.

    usoldstate (USHORT)

      Old check state of the button control.

    • Unchecked 1
        Checked
      2
        Indeterminate.

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