title: What's the proper size of a custom AppBarButton image
body: <p>In stead of using the default symbol icons from <a href="https://msdn.microsoft.com/en-us/library/windows/apps/xaml/jj841127.aspx" rel="nofollow">Microsoft</a>, I want to create some custom icons. Then I read upon <a href="https://msdn.microsoft.com/en-us/library/windows/apps/xaml/jj662743.aspx" rel="nofollow">this</a> which explains how to achieve this. </p>
  
  <pre><code>&lt;AppBarButton Label="BitmapIcon" Click="AppBarButton_Click"&gt;
      &lt;AppBarButton.Icon&gt;
          &lt;BitmapIcon UriSource="ms-appx:///Assets/globe.png"/&gt;
      &lt;/AppBarButton.Icon&gt;
  &lt;/AppBarButton&gt;
  </code></pre>
  
  <p>The above is working great. But my question is: what should the size of the icon image be (in this case globe.png)? </p>