Progress
Programming
Handbook
User-interface Triggers
For each widget you define or create, you can establish one or more user-interface triggers. A user-interface trigger is a block of code associated with an event-widget pair (that is, with a specific event and a specific widget). The trigger executes whenever that event is applied to that widget. User interface triggers allow you to write event-driven applications.
NOTE: Progress also provides procedure triggers that allow you to apply events to a procedure handle to execute code in the specified procedure. For more information, see Block Properties."
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