TDBCombo, additem Mode and Bookmarks

Hi All,
I have a question I hope you all can help me with. I'm using several TDBCombos in my app and I would like to set the bookmark of each item added to the list with a code. Is this possible.
What I would like to be able to do is follows:
When setting the value of the control from the database. I would like to be able to take the code that is saved in the database, and use this value to set the display text for the combo. Ok, If the value stored in the database was 3, I'd like to use something like this:
tdbcombo1.SelectedItem = 3

If these code where all in sequence starting at 0 it appears that it may work, but right now I have codes that skip like this
1, 2, 3, 9, 10, 11, 12, 13. And so far none of the codes start at 0. What do you all think. Thanks for any help.
Michael Lee