Button-control-data structure.

typedef struct _BTNCDATA {
  USHORT      cb;             /*  Length of the control data in bytes. */
  USHORT      fsCheckState;   /*  Check state of button. */
  USHORT      fsHiliteState;  /*  Highlighting state of button. */
  LHANDLE     hImage;         /*  Resource handle for icon or bit map. */
} BTNCDATA;

typedef   BTNCDATA   * PBTNCDATA ;