<data:DataGrid x:Name="dataGrid4" 
    Height="210" Width="450" Margin="0,5,0,10" 
    RowHeight="44" >    
    <data:DataGrid.Columns>
        <data:DataGridTextBoxColumn 
            Header="First Name" 
            Width="70"
            DisplayMemberBinding="{Binding FirstName}" 
            FontSize="20" />
        <data:DataGridTextBoxColumn 
            Header="Last Name" 
            Width="70"
            DisplayMemberBinding="{Binding LastName}" 
            FontSize="20" />
        <data:DataGridTextBoxColumn 
            Header="Address"
            Width="120"
            DisplayMemberBinding="{Binding Address}" >
            <data:DataGridTextBoxColumn.ElementStyle>
                <Style TargetType="TextBlock">
                    <Setter Property="TextWrapping" Value="Wrap"/>
                </Style>
            </data:DataGridTextBoxColumn.ElementStyle>
            <data:DataGridTextBoxColumn.EditingElementStyle>
                <Style TargetType="TextBox">
                    <Setter Property="Foreground" Value="Blue"/>
                </Style>
            </data:DataGridTextBoxColumn.EditingElementStyle>
        </data:DataGridTextBoxColumn>
        <data:DataGridCheckBoxColumn 
            Header="New?" 
            Width="40"
            DisplayMemberBinding="{Binding IsNew}" />
        <data:DataGridCheckBoxColumn 
            Header="Subscribed?" 
            Width="75"
            DisplayMemberBinding="{Binding IsSubscribed}" 
            IsThreeState="True" />

    </data:DataGrid.Columns>
</data:DataGrid>