WPF: Setting DataContext of a UserControl with Binding not working in XAML?

This is not an answer to the question, but might help others in the same circumstances.

I suspect it is because the childViewModel property does not raise the PropertyChanged event. When the binding is evaluated, it is possible that this property is null (in which case the DataContext will just fall back to the parent's one). When the childViewModel is instantiated later, no PropertyChanged event is raised, and the binding is never informed that there is now a DataContext.

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