asterisk users - Apr 2012 - Digium D40 Direction map 'X' key not functioning

Hello,
Is there a way to make the the 'X' key next to the direction map close
the menu system or do anything? It's kind of annoying to have to press
the "Line 1" key.

http://www1.digium.com/sites/default/files/support/d40_phoneusersheet.pdf

Thanks,
Dennis