BTNCDATA

typedef structc _BTNCDATA {
  USHORT      cb;                // length of control data in bytes
  USHORT      fsCheckState;      // check state of button
  USHORT      fsHilightState;    // highlight state of button
  LHANDLE     hImage;            // resource handle for icon/bitmap
} BTNCDATA, *PBTNCDATA;