title: windows phone 8 grid checkbox check and uncheck
body: <p>i have a 100 * 100 grid on one of the page in my app. i have a single checkbox on the top right of the grid. </p>
  
  <p>what i want is that when the user tap or click on the grid first time the checkbox become checked and when i again taps on the grid the checkbox becomes unchecked. how can i achieve it? i am talking about the metro type checkboxes here. or could i use checkbox itself in this manner? is grid the right way to go? </p>
  
  <p>In short i need some guidelines in solving the above problem?</p>