title: Calculate and draw route on Bing Maps control
body: <p>in my app for WP7(mango) I need to navigate the user from one point to another. I know there is the Map control that lets you draw staff on it, but how do you ask it to draw the path for you? (based on the specified destination &amp; user's current location - but that keeps changing so how do you update the route if he goes of the way?)</p>