The data structure contains information used as the graphic button control data.
typedef struct _GBTNCDATA {
USHORT usReserved; /* Reserved field. */
PSZ pszText; /* Initial text of button. */
HMODULE hmod; /* Handle of bitmap resource. */
USHORT cBitmaps; /* Number of bitmaps. */
USHORT aidBitmap[1]; /* Array of bitmap IDs. */
} GBTNCDATA;
typedef GBTNCDATA * PGBTNCDATA ;