title: GridView with 2 items in each row
body: <p>I want to show two GridViewItems in each row, with equal width. how can I achieve that?</p>
  
  <p>I am using following template but it is not taking equal space between items.</p>
  
  <pre><code> &lt;DataTemplate x:Key="GridViewItemTestTemplate"&gt;
          &lt;StackPanel Orientation="Horizontal"&gt;               
              &lt;Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}" Margin="0,9.5,0,0"&gt;
                  &lt;Image Height="79" Width="79"/&gt;
              &lt;/Border&gt;
              &lt;StackPanel Grid.Column="1" Margin="14.5,0,0,0"&gt;
                  &lt;TextBlock Text="{Binding Title}" Style="{ThemeResource ListViewItemTextBlockStyle}"/&gt;
                  &lt;TextBlock Text="Subtitle" Style="{ThemeResource ListViewItemSubheaderTextBlockStyle}"/&gt;
              &lt;/StackPanel&gt;
          &lt;/StackPanel&gt;
      &lt;/DataTemplate&gt;
  </code></pre>
  
  <p>here is my gridview.</p>
  
  <pre><code>  &lt;GridView ItemsSource="{Binding MyData}" ItemTemplate="{StaticResource GridViewItemTestTemplate}" 
                    IsSwipeEnabled="False" SelectionMode="Single" HorizontalContentAlignment="Stretch"&gt;
          &lt;/GridView&gt;
  </code></pre>