Read original post by Nigel Sampson at Compiled Experience Blog
When building apps sometimes you need to make things “ click-able” with either a mouse, finger or some other pointing type device. The default button templates for both Windows Phone and Windows 8 are great, but aren't useful if you just want to wrap them around some content.
Possible solutions I've seen include not using buttons but just using something like the Tapped event on content, others including re-styling the Content Template of the button to remove everything but the content itself.