need help in routed event in wpf

Routed events in WPF are basically of three types.

Direct events are standard events for e.g. a button raises a click.

Bubbling events are raised by a source control and then moved up the visual tree till it is handled by another control e.g. a click on a button inside a cell could traverse upto grid level.

Tunneling events work reverse and are raised at the control at root level and travel down the visual tree till they hit the source element.

You don't really need a situation to use these events. They are happening all the time when you use WPF.