Release 10.1A: OpenEdge Development:
ADM Reference

valueChanged

Procedure that defines the persistent event handler of the value-changed event of the frame. This handler is important to how a viewer and browser sets DataModified to TRUE. Because all field-level objects value-changed events are also managed by this procedure, it calls fieldModified to set DataModified to TRUE based on the setting for the ModifyFields property.

Location: viewer.p

Parameters: None

Notes:

Static objects can reach this also by applying U10 event to run it.
See the "ModifyFields" section for more information.