Marking Routed Events as Handled, and Class Handling

Marking Routed Events as Handled, and Class Handling: "Also, input routed events that have a tunneling and bubbling pair have a distinct handling logic. If the tunneling/preview routed event is marked as handled by an event listener, then the bubbling routed event will be marked handled even before any listeners of the bubbling routed event receive it. The tunneling and bubbling routed events are technically separate events, but they deliberately share the same instance of event data to enable this behavior."