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# On Event
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Raise an event in the event bus.
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```sig
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control.onEvent(control.eventSourceId(EventBusSource.MICROBIT_ID_BUTTON_A), control.eventValueId(EventBusValue.MICROBIT_EVT_ANY), () => { });
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```
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**This is an advanced API.** For more information, see the
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[@boardname@ runtime messageBus documentation](https://lancaster-university.github.io/microbit-docs/ubit/messageBus/).
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