Fired when the application transitions to the background.
This event fires when the user leaves the application or it is paused due to notifications
and incoming phone calls.
for the exact behavior that triggers this event.
Note that calls to functions that modify the UI during this event may be partially executed,
up to the UI call before the suspension. If this happens, the remainder of the code
will be executed after the application is resumed, but before the
resume event is triggered.
Source object that fired the event.
Name of the event fired.