Shouldn't an item covering a button inactive it?

I'm developing a course that only uses on-screen buttons (i.e., no Articulate player; every slide is locked and has the appropriate buttons for Prev, Next, and/or other links). Currently, I have the Prev and Next buttons hidden by a shape; the shape animates off after the other elements animate on, thus revealing the navigation. The buttons are on the slide master.

However, when I publish the course, I can still click tthe Prev and Next buttons (well, the area over them, that is) to go back or forward, even when they're covered. FYI: The shape has been moved to the front of all other items, so it is covering the buttons. 

Shouldn't any item covering a button prevent that button from being clicked? 

Thanks for any help/advice.

- Judy 

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