MX-980 with latest CC software.

I haven't tried swapping buttons before on different pages. I brought up the three pages in cascade view mode. I then held down the ALT button and dragged a button over the top of another button. When I let go, a pop-up appeared asking how I wanted to do the Paste Special. Instead of swapping the buttons, it copied the button. The original was left alone. That is not how it is supposed to work, according to the manual (page 32).

Holding SHIFT and ALT works. But, if I also wanted to swap artwork, it doesn't.

Is this a bug, or an incorrect manual?