How to create custom pair of event/preview event?

Question

I mean if i have some custom event with bubbling strategy, then who must declare preview event and who must care about its raising? Me or WPF?

for example I has class with event

public class WindowControl : ContentControl
{
public static readonly RoutedEvent StateChangedEvent;


static WindowControl()
{
WindowControl.StateChangedEvent = EventManager.RegisterRoutedEvent("StateChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(WindowControl));
}
 public event RoutedEventHandler StateChanged
{
   add { base.AddHandler(WindowControl.StateChangedEvent, value); }
   remove { base.RemoveHandler(WindowControl.StateChangedEvent, value); }
}

private void RaiseStateChangedEvent()
{
  RoutedEventArgs newEventArgs = new RoutedEventArgs(WindowControl.PreviewStateChangedEvent, this);
  this.RaiseEvent(newEventArgs);
}

}

I suppose that as someone wants to subscribe on preview event of my control, I must declare it too, except the only thing that it would have tunneling strategy. So question is - should I generate it by myself and where? I tried so (suppose we have PreviewStateChanged declared):

 private void RaiseStateChangedEvent()
        {
            RoutedEventArgs newEventArgs = new RoutedEventArgs(WindowControl.PreviewStateChangedEvent, this);
            this.RaiseEvent(newEventArgs);

            newEventArgs = new RoutedEventArgs(WindowControl.StateChangedEvent, this);
            this.RaiseEvent(newEventArgs);
        }

It raises ok, but despite that I change e.Handeled = true StateChangedEvent is being fired. Thus I conclude that WPF routing system doesn't treat them as linked events. Or maybe (and more probably) I'm doing something wrong -)

So I need some help -)