How can I set fixed index for a List Box string?

hwndCombobox= CreateWindow(TEXT("LISTBOX"),
NULL,WS_CHILD|WS_VISIBLE|LBS_STANDARD|LBS_SORT,
500,70,300,300,hwnd,
(HMENU)ID_OPEN_ACCOUNT_LISTBOX,
(HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE), NULL) ;
SendMessage(hwndCombobox,LB_ADDSTRING,0(LPARAM)ReadFileStore);// In this String Adding Message, can I set fixed index of List Box ?