Combobox + Dataset wich value show?

Hi all
I get data in mycombo thru sql+php+xml and a dataset that binds to this combo.
I need 2 value from the combo, but only one must be shown (the label for example) while the second value is needed for feed-back with db!
If in the Schema-Tab I add a field “ID” for example everything works fine, but I get the combo with “1, Label” etc.

How i can get this works?
Thank you in advance
L :wasted: