title: How does binding two slider XAML control values together work?
body: <p>I made a simple blank metro store app in VS2012 and added two sliders in a StackPanel, like this:</p>
  
  <pre><code>&lt;StackPanel&gt;
       &lt;Slider Name="sliderTest1" Value="{Binding ElementName=sliderTest2, Path=Value}" /&gt;
       &lt;Slider Name="sliderTest2" Value="{Binding ElementName=sliderTest1, Path=Value}" /&gt;
  &lt;/StackPanel&gt;
  </code></pre>
  
  <p>I expected that sliding either slider would cause them both to move. And that's true as long as I've only touched one slider. As soon as I touch the other slider, they no longer move together. </p>
  
  <p>Why is that?</p>