title: How can I automatically show a tooltip if the text is too long?
body: <p>In a Windows Store Application I have the following TextBlock:</p>
  
  <pre><code>        &lt;TextBlock Text="Seriously long text for the purpose of showing tooltip"
                     TextTrimming="CharacterEllipsis" /&gt;
  </code></pre>
  
  <p>How do I automatically show a tooltip when the text is too long to display without an ellipsis?</p>