The propagation phases of an event.
When an element receives an event, the event is propagated along a path built from the elements between the panel root and the target element. In the TrickleDown phase, the event is sent from the root element to the target parent element. In the AtTarget phase, the event is sent to the target element. In the BubbleUp phase, the event is sent from the target parent element to the root element. In the last phase, the DefaultAction phase, the event is resent to the target element.
| None | The event is not being propagated. |
| TrickleDown | The event is being sent from the root element to the target parent element. |
| AtTarget | The event is being sent to the event target. |
| BubbleUp | The event is being sent to the event target parent element up to the root element. |
| DefaultAction | The event is being sent to the target element for it to execute its default actions for this event. Event handlers do not get the events in this phase. Instead, ExecuteDefaultAction is called on the target. |
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