title: Implement items list with multiple selection
body: <p>In my WP8 application I would like to implement a functionality that is very similar to what is present in standard mail app - an ability for user to select multiple items from list. I've provided some screenshots to illustrate this behavior:</p>
  
  <p>Normal state:<br>
  <img src="https://i.stack.imgur.com/kIzlS.jpg" alt="Normal state">  </p>
  
  <p>User taps item's left corner and it becomes blue:
  <img src="https://i.stack.imgur.com/tDfrJ.jpg" alt="User taps item&#39;s left corner and it becomes blue">  </p>
  
  <p>Item is selected<br>
  <img src="https://i.stack.imgur.com/Ss1RN.jpg" alt="Item is selected"></p>
  
  <p>My question is if this multiple selection ability is a standard option for some container control or if I should do some custom programming to achieve this? In the latter case, what's the best approach you'd take to implement this, please share your thoughts.</p>