title: MouseLeftButtonUp does not fire
body: <p>I have a <code>Button</code></p>
  
  <pre><code>&lt;Button&gt;
      &lt;Button.Template&gt;
          &lt;ControlTemplate&gt;
              &lt;StackPanel&gt;
                  &lt;Image Source="share.png" 
                         MouseLeftButtonUp="Image_MouseLeftButtonUp"
                         MouseLeftButtonDown="Image_MouseLeftButtonDown" /&gt;
              &lt;/StackPanel&gt;
          &lt;/ControlTemplate&gt;
      &lt;/Button.Template&gt;
  &lt;/Button&gt;
  </code></pre>
  
  <p>But the problem is that, unlike MouseLeftButtonDown, the event MouseLeftButtonUp does not fire. Why? How can I solve it? Thanks.</p>