Found a bug in Prism Region Context last month and Prism team has quick fix for this that work flawless!
Thread posted: Region context set to NULL when remove any view in region
Solution : Prism v4: RegionContext lost when removing a view from a region
You can find the sample project in my thread, looks for the name “Prism_RegionContext”, and below shows the key part captured, read the comments:
Search keywords : Prism v4.0, context, region, Communicating between components, MVVM
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