Event that fires when this MiniToolbar is shown.
| Name | Type | Description |
| BeforeOrAfter | EventTimingEnum | Input EventTimingEnum indicating if the event is being fired before (kBefore) or after (kAfter) the mini toolbar is shown. Notification is only sent after the mini toolbar has shown, so this value is always kAfter. |
| Context | NameValueMap | Input NameValueMap object that can be used to determine the context of why the event fired. |
| HandlingCode | HandlingCodeEnum | Output HandlingCodeEnum that indicates how you are handling the event. The value of this argument is currently ignored for this event. |