title: style the Pivot header in windows universal 10
body: <p>I am trying to center the pivot header in my universal 10 app,my code is this:</p>
  
  <pre class="lang-xml prettyprint-override"><code> &lt;Pivot&gt;
      &lt;PivotItem x:Name="pivot0" Margin="0"&gt;
          &lt;PivotItem.Header &gt;
             &lt;Image x:Name="headerimg" Source="images/1.png"  PointerExited="pointerExited" Height="40" Stretch="Uniform" PointerMoved="headerimg_PointerMoved" /&gt;
          &lt;/PivotItem.Header&gt;
          &lt;Grid &gt;
  
          &lt;/Grid&gt;
      &lt;/PivotItem&gt;
  
      &lt;PivotItem&gt;
         &lt;PivotItem.Header&gt;
             &lt;Image x:Name="headerimg1" Source="images/2.png"  Height="40" Stretch="Uniform" PointerExited="headerimg1_PointerExited" PointerMoved="headerimg1_PointerMoved" /&gt;
         &lt;/PivotItem.Header&gt;
         &lt;Grid&gt;
            &lt;TextBlock Text="test3"&gt;&lt;/TextBlock&gt;
         &lt;/Grid&gt;
      &lt;/PivotItem&gt;
  &lt;/Pivot&gt;
  </code></pre>
  
  <p>I have an idea to use a header template,but I don't know how can I center the pivot header,
  thanks for help</p>