title: Assign image to imagebox on pointermoved event
body: <p>I have a Windows 8.1 App. I have developed a user control. The user control is in a shape of a location bar and the user control has a imagebox inside it. 
  The usercontrol will appear when any user taps the screen for a long time.At this point of time ,the image box should get the image from the pixels nearbythe click event. Now when the user moves his finger around the app , the image box should display pixels around that area only. Once the user releases his finger , the control gets disabled .</p>
  
  <p>So the problem is , I want to update the image box in the control wherever the finger goes .</p>