A database tier maintains and provides access to a database. An application tier receives and responds to requests for a form. The form includes data defining a first UI control for displaying a first value from the database and a second UI control for displaying a second value from the database that is dependent upon the first value. A client tier renders the form to show the first value in the first UI control and to show the second value in the second UI control. The client tier also detects a modification to the first value and causes an updated second value to be generated in response to detecting the modification to the first value. The updated second value is displayed by way of the second UI control. The updated second value is generated at the client tier, the application tier, the database tier, or at a combined application/database tier.