How do I know an RoutedEvent is attached event or not?

Hi there,

I know Button.Click is an attached event. But MSDN document doesn't mention it at all.

http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.buttonbase.click.aspx

Are all routedevents in UIElement and its derived elements attached events?

Can anyone explain them?

Thanks.

Rulin