Eclipse E4 EventService not unregistered if object is uninjected

Question

I am creating a jface dialog which listens to e4 events by registering via injection:

@Inject
@Optional
public void process(@UIEventTopic("someEvent") final Object unused)

I inject the dialog like so:

ContextInjectionFactory.inject(myDialog, context);

Now, once I close the dialog, I would like to unregister from the event service. I tried calling the uninject method, but it does not seem to have any effect.

ContextInjectionFactory.uninject(myDialog, context);

What is the correct way of unregistering?