After further investigation it appears that the back nav button can be visible even if you have reached the top level in the page hierarchy.
This happens in both dev and existing store apps whereby after navigating into say, item detail, then back up a hierarchy, the back button is visible on the landing page - clicking it does nothing except hide the button.
So although Rob's answer is correct, the back button is sometimes visible when it shouldn't be.
I can reproduce this behaviour.
(please excuse me if my store app terminolgy is incorrect, just getting up to speed)
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