title: Windows 8: Set default email address when invoking Share charm's mail feature
body: <p>I need to set a default email address when invoking the Share charm's mail feature.
  Specifically, I already know the recipient's email address.</p>
  
  <p>As a result, I want to populate the mailto address with this data instead of forcing the user to insert this data manually.</p>
  
  <p>Any suggestions?</p>
  
  <pre><code>    public void OnHtmlRequested(DataRequestedEventArgs args, string title, string html)
      {
          args.Request.Data.Properties.Title = title;
          args.Request.Data.Properties.Description = "my description";
  
          args.Request.Data.SetHtmlFormat(HtmlFormatHelper.CreateHtmlFormat(html));
      }
  </code></pre>