Get it to display the value (on a screen) held in the data table?

I've got a ComboBox on my "Set Security" screen

I've created the Data Collection as
"1 - Description 1"
"2 - Description 2"
etc

there are 4 elements, total.

I've got a field "SecurityLevel" in the table and when someone enters a UserID on the screen I've got a stored procedure that looks up the UserID and passes back the Security Level. Now I need the ComboBox to display the item in the Data Collection that corresponds to that Security Level

I'm really, REALLY beginning to hate .Net