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Except....when you 'lock' a reusableview. Then the view is tied to the data it shows and when opening a view for other data the view will not be reused. Therefore a new view will be opened (if no other resuable non-locked view is open). A lock image will be shown in the tab of the view to show whether when it is locked.
If you want your view to have this behaviour you should use IReusableView.