public class FakeData
    {
        public int Col1 { get; set; }
        public int Col2 { get; set; }

        public int Fld1 { get; set; }
        public int Fld2 { get; set; }
        public SolidColorBrush FldColor { get { return new SolidColorBrush(Fld1 == Fld2 ? Colors.Red : Colors.Black); } }
    }
    public class FakeDataColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            FakeData obj = value as FakeData;
            if (obj == null) return new SolidColorBrush(Colors.Black);
            return new SolidColorBrush(obj.Col1 == obj.Col2 ? Colors.Red : Colors.Black);
        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
    }
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            dataGrid1.ItemsSource = new List<FakeData>(){
                new FakeData(){Col1=1,Col2=1,Fld1=2,Fld2=3},
                new FakeData(){Col1=1,Col2=2,Fld1=3,Fld2=3}
            };
        }
    }

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <src:FakeDataColorConverter x:Key="ColorConverter" />
        </Grid.Resources>
        <sdk:DataGrid AutoGenerateColumns="False" Name="dataGrid1">
            <sdk:DataGrid.Columns>
                <sdk:DataGridTemplateColumn Header="Col1">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Margin="4" Text="{Binding Col1}" Foreground="{Binding Converter={StaticResource ColorConverter}}" />
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
                <sdk:DataGridTemplateColumn Header="Col2">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Margin="4" Text="{Binding Col2}" Foreground="{Binding Converter={StaticResource ColorConverter}}" />
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
                <sdk:DataGridTemplateColumn Header="Fld1">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Margin="4" Text="{Binding Fld1}" Foreground="{Binding FldColor}" />
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
                <sdk:DataGridTemplateColumn Header="Fld2">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Margin="4" Text="{Binding Fld2}" Foreground="{Binding FldColor}" />
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
            </sdk:DataGrid.Columns>
        </sdk:DataGrid>
    </Grid>