Prism:EventAggregator and MEF - 2 different instances of EventAggregator?

The problem is that the MefBootstrapper creates a Container but does not register it as the DEFAULT container. When SatisfyImports is called, MEF does not see any container, so it creates a new one. That is why the instances are different, because 2 different containers are being created.

To solve this, simply set the Prism Container as the default container for MEF to use.

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