Unit of work to perform during the execution of an event handler. A single event handler can have multiple event actions.
Depending on its action type, an event action can do such things as:
- Evaluate and compare expressions, using the results to select which event action of its event handler to perform next.
- Affect the event's visual state.
- Complete the event.
- Set event variables.
- Call methods.
- Perform other predefined tasks.