title: How to get MessageBox.Show() to pop up in the middle of my WPF application?
body: <p>I have a 700w x 300h WPF applciation and can drag it anywhere on my large screen.</p>
  
  <p>When my application executes:</p>
  
  <pre><code>MessageBox.Show("Sorry, this function is not yet implemented.");
  </code></pre>
  
  <p>the mesage box appears in the middle of my <em>screen</em>, which may or may not even be near the application itself.</p>
  
  <p>How can I get my MessageBox to appear in the middle of my <em>application</em> instead?</p>