BM_SETCHECK - Parameters

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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