title: Image Source and Caching
body: <p>I use the following code to show images from a webserver:</p>
  
  <pre><code>   &lt;Image Source="{Binding Url}" /&gt;
  </code></pre>
  
  <p>The image gets automatically downloaded, and I assume there is also some caching based on the Url.</p>
  
  <p>My problem is, that when the app is offline, the assumably cached images are not shown.</p>
  
  <p>Is there any way to change the caching behavior, so that images are also loaded when there is no network available? Pointers to documentation regarding the caching would be very helpful as well.</p>