How the even routing method works in Silverlight?

Answer

Event routing is an important concept that is based on the visual tree. Routing of the events support RoutingStragegy of Bubble, Tunnel and Direct methods that are used to make it possible.
Bubble: is the most used routing method used. It allows a bubble to propagate the visual tree from source element till it is handled differently to reach the root element. It also allows the event of an object to be handled by the element hierarchy coming from the source element.
Tunnel: they start at the root element and then traverse down the element in the tree till they have handled and reached the source element of the event. They have their own names that are prefixed with Preview like PreviewMouseDown.
Direct: are the normal events that handles the event delegates hooked up to an event.