Button information block.

typedef struct _MB2INFO {
  ULONG        cb;          /*  Current size of the structure. */
  HPOINTER     hIcon;       /*  Icon handle. */
  ULONG        cButtons;    /*  Number of buttons. */
  ULONG        flStyle;     /*  Icon style flags. */
  HWND         hwndNotify;  /*  Owner notification handle. */
  MB2D         mb2d[1];     /*  Array of button definitions. */
} MB2INFO;

typedef   MB2INFO   * PMB2INFO ;