title: Cannot get button working inside HubSection HeaderTemplate
body: <p>I have a Hubsection with a Textblock and a button in HeaderTemplate. It works ok in Windows 8, but I've migrated the app to UWP and now I can not click the button.</p>
  
  <pre><code>&lt;HubSection
  Width="480"
  HorizontalAlignment="Stretch"
  Header="_XX"
  IsHeaderInteractive="True"&gt;
  &lt;HubSection.HeaderTemplate&gt;
      &lt;DataTemplate&gt;
          &lt;Grid Width="392" Margin="0,-10,0,-10"&gt;
              &lt;Grid.ColumnDefinitions&gt;
                  &lt;ColumnDefinition /&gt;
                  &lt;ColumnDefinition /&gt;
              &lt;/Grid.ColumnDefinitions&gt;
  
              &lt;TextBlock
                  HorizontalAlignment="Left"
                  VerticalAlignment="Top"
                  FontSize="28"
                  Text="{Binding}" /&gt;
              &lt;AppBarButton
                  Grid.Column="1"
                  HorizontalAlignment="Right"
                  VerticalAlignment="Top"
                  Command="{Binding ElementName=HubSection, Path=DataContext.MyCommand}"&gt;
                  &lt;AppBarButton.Icon&gt;
                      &lt;FontIcon
                          FontFamily="{StaticResource IconsFontFamily}"
                          FontSize="26"
                          Glyph="&amp;#xE602;" /&gt;
                  &lt;/AppBarButton.Icon&gt;
              &lt;/AppBarButton&gt;
          &lt;/Grid&gt;
      &lt;/DataTemplate&gt;
  &lt;/HubSection.HeaderTemplate&gt;
  &lt;DataTemplate&gt;
      ...
  &lt;/DataTemplate&gt;
  </code></pre>
  
  <p></p>
  
  <p>Help will be appreciated, thanks in advance.</p>