title: How to determine shift+alt+control+menu keys pressed win8 metro app
body: <p>I am working on a project and I have some textboxes some of them digits only but in xaml inputscope="number" the virtual keyboard appears with some characters too like "[ + % ]" .... 
  I used key.down event but shift+4 (+) is passed the exeception
  I searched and found control.modiferKey but its not on metro app</p>
  
  <p>I think that </p>
  
  <pre><code>if keyDown is shift boolean = true 
  if keyUp boolean = false 
  if boolean == true and digit pressed do nothing 
  </code></pre>
  
  <p>but there must be a simple way 
  can anyone help me?</p>