title: How to set background image in Windows Phone 8?
body: <p>I am very new to <code>WP</code> apps and don't know how to set the <code>back-ground</code> image in <code>app.xaml</code> file for whole application in <code>Windows Phone 8</code> app. Up-till now, i have placed some <code>controls</code> over it but fail to set background image. I have seen some material but did not work. Any help will be appreciated !</p>