Open new WPF Window / Multithreading

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Hi guys, I seem to be having a crappy day, I can't figure anything out!! lol

 

I have an app that has a WCF service.

 

When a message arrives via my service, I fire an event called NewMessage()

 

In the event Handler, I want to open a new WPF window to display the message contents.

 

The problem is, the event is obviously not firing from the UI thread, and therefore my handler cannot create a new window.

 

 

However I can't do a Dispatcher.Invoke, because I have no object on which to call the dispatcher if that makes sense?

 

How can I achieve this?

 

 

 

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