title: How to open a popup menu when a button is clicked?
body: <p>I have a button with an Image as its content in a toolbar. I would like this button to open a menu beneath it when clicked. How?</p>
  
  <pre><code>&lt;Toolbar&gt;
              &lt;Button&gt;
                  &lt;Button.Content&gt;
                      &lt;Image  Source="../Resources/help.png"&gt;&lt;/Image&gt;
                  &lt;/Button.Content&gt;
              &lt;/Button&gt;
  &lt;/Toolbar&gt;
  </code></pre>
  
  <p>Thanks!!</p>