typedef struct tagNMTOOLBARA {
    NMHDR   hdr;
    int     iItem;
    TBBUTTON tbButton;
    int     cchText;
    LPSTR   pszText;
#if (_WIN32_IE >= 0x500)
    RECT    rcButton;
#endif
} NMTOOLBARA, *LPNMTOOLBARA;