The "kebab-case" classname of the emitter that raised the event.
OpenFin.Frame is represented as iframe.
The type of event that was raised. Equal to the typename of the event payload in "kebab case".
Guaranteed to be unique within each topic, but can be repeated between topics (e.g. WebContentsEvents.CrashedEvent and ApplicationEvents.CrashedEvent).
True if the download button should be displayed, false if it should be hidden.
Generated when the visibility of the window's download button changes. Only raised if the download bubble feature is enabled.