<Border xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    BorderBrush="Black" BorderThickness="1" Padding="5" Background="White">
    <Grid Grid.Row="8" Name="grdAccounts" Grid.ColumnSpan="2" Margin="5,0,5,0" HorizontalAlignment="Stretch">        
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />  
        </Grid.ColumnDefinitions> 
    </Grid> 
</Border>