int InsertString( int nIndex, const char FAR* lpString );
nIndex
Contains the zero-based index to the position in the list box that will receive the string. If this parameter is -1, the string is added to the end of the list.
lpString
Points to the null-terminated string that is to be inserted.
Inserts a string into the list box of a combo box. Unlike the AddString member function, the InsertString member function does not cause a list with the CBS_SORT style to be sorted.
The zero-based index of the position at which the string was inserted. The return value is CB_ERR if an error occurs. The return value is CB_ERRSPACE if insufficient space is available to store the new string.
CComboBox::AddString, CComboBox::DeleteString, CComboBox::ResetContent, CB_INSERTSTRING