Read original post at Iris Classon's Blog
If you do Windows Store App development you know they want you to get those margins correct! I got tired of looking up the margins guidelines for each app as my mind has problems remembering numbers (I can remember all my clothes and all the thousands of combinations I can create, but cannot remember a pin code or birthdays) and therefore I created a cheat sheet based of the MSDN article on the Grid System / Layout.