Provide a Change View choice in the View menu if your application allows a
user to switch among three or more views.
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Make Change View a cascading choice; its cascaded menu should list the
available views.
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Indicate the current view active in the window by displaying that
view's choice in the cascaded menu with unavailable emphasis and,
optionally, by including a check graphic next to it.
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Do not open a new window as a result of activating Change View; instead,
display the new view of the element in the current window.
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Do not change the underlying data being viewed when the user changes the
view.