title: Stretch button to parent container
body: <p>I'm trying to create a layout similar to telerik's <a href="http://www.telerik.com/libraries/windows_phone_8/numericupdown-1-windows-phone-control.sflb" rel="nofollow">numeric updown control</a>
  inside the content panel grid but I can't get the buttons to stretch in grid cells. How can I achieve this?</p>
  
  <pre><code>&lt;Grid x:Name="ContentPanel" 
        Grid.Row="1" 
        Margin="12,6,12,0" 
        Height="70"&gt;
     &lt;Grid.ColumnDefinitions&gt;
         &lt;ColumnDefinition Width="*"/&gt;
         &lt;ColumnDefinition Width="70"/&gt;
         &lt;ColumnDefinition Width="70"/&gt;
     &lt;/Grid.ColumnDefinitions&gt;
  
     &lt;Border Grid.Column="0"
             BorderThickness="2"
             BorderBrush="{StaticResource PhoneForegroundBrush}"&gt;
        &lt;TextBlock Text="Count" 
                   VerticalAlignment="Center" 
                   Margin="12"/&gt;
     &lt;/Border&gt;
     &lt;RepeatButton Grid.Column="1" 
                   Content="-"/&gt;
     &lt;RepeatButton Grid.Column="2" 
                   Content="+"/&gt;
  &lt;/Grid&gt;
  </code></pre>