Adding a field to the field-definitions using Diamond Access

I hope anybody can help me quick, as my custommer is waiting for his

For the last couple of hours I've been trying to update a Access-table using
Diamond Access. I have an aditional field that the program should add to the
existing database. However I had no luck yet. Even though I don't get any
errors from the program, the update is not executed to the database itself.

After using
  With DAOTable1.FieldDefs.AddFieldDef DO
       Name ...

and closing the database, the exta field is not added to the field

I probably am forgetting one more command, but I haven't got a clue which
one. I hope you can help me

Thanks !

Marc van Leeuwen