c# / xaml - Bottom Bar is positioned wrong
<p>I have created a Bottom Bar with the following xaml code:</p>

<pre><code>&lt;CommandBar x:Name="combar" VerticalAlignment="Bottom" Background="#FF2290AF" SizeChanged="CommandBar_SizeChanged"&gt;
    &lt;AppBarButton Icon="Refresh" Label="Aktualisieren" Click="AppBarButton_Click" /&gt;
    &lt;AppBarSeparator/&gt;

    &lt;CommandBar.Content&gt;
        &lt;ProgressRing x:Name="loading_ring" Width="48" Height="48" HorizontalAlignment="Left" VerticalAlignment="Bottom" Foreground="White" /&gt;
    &lt;/CommandBar.Content&gt;
&lt;/CommandBar&gt;
</code></pre>

<p>In Visual Studio it looks like:
<a href="https://i.stack.imgur.com/fOpHw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fOpHw.png" alt="VS_Picture"></a></p>

<p>During runtime the bottom bar is displayed like that:
<a href="https://i.stack.imgur.com/eyVvF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eyVvF.png" alt="Screenshot runtime"></a></p>

<p>Does anybody know a solution?</p>