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RegionManagerRegistrationBehavior never stop monitoring the RegionManager
When a view containing region(s) is removed, the reference to the view remain and the view never get disposed.
When view containing region(s) is removed from a region, RegionManagerRegistrationBehavior should stop monitoring the RegionManager to release the reference to the view.
Unfortunately, the RegionBehavior does not get notified when the region get detached.