Grid in ScrollViewer

   
       

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  HorizontalAlignment="Center" VerticalAlignment="Center">
<ScrollViewer>
  <Grid>
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*" />
      <ColumnDefinition Width="Auto" />
      <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
      <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>

    <Border Grid.Column="0" Grid.Row="0" Background="LightGray" BorderBrush="Gray" BorderThickness="1">
      <TextBlock>Key</TextBlock>
    </Border>
    <Border Grid.Column="1" Grid.Row="0" Background="LightGray" BorderBrush="Gray" BorderThickness="1">
        <TextBlock>Value</TextBlock>
    </Border>
    <Border Grid.Column="2" Grid.Row="0" Background="LightGray" BorderBrush="Gray" BorderThickness="1">
      <TextBlock>Value 2</TextBlock>
    </Border>
    <TextBlock Grid.Column="0" Grid.Row="1" Text="WPF" />
    <TextBlock Grid.Column="1" Grid.Row="1" Text="Inc." />
    <TextBlock Grid.Column="2" Grid.Row="1" Text="this" />
    <TextBlock Grid.Column="0" Grid.Row="2" Text="is" />
    <TextBlock Grid.Column="1" Grid.Row="2" Text="a" />
    <TextBlock Grid.Column="2" Grid.Row="2" Text="test" />
  </Grid>
</ScrollViewer>
</Page>