在WPF Toolkit的DataGrid中跨越多行记录

<Style x:Key="MergedCellDataGridStyle" TargetType="DataGrid">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="DataGrid">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                    <ScrollViewer x:Name="DG_ScrollViewer"
                                  Focusable="false">
                        <ScrollViewer.Template>
                            <ControlTemplate TargetType="ScrollViewer">
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="Auto" />
                                        <ColumnDefinition Width="*" />
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="Auto" />
                                        <RowDefinition Height="*" />
                                    </Grid.RowDefinitions>
                                    <DataGridColumnHeadersPresenter x:Name="PART_ColumnHeadersPresenter"
                                                                    Grid.Column="1" />
                                    <ItemsPresenter x:Name="ItemsPresenter"
                                                    Grid.Column="1"
                                                    Grid.Row="1" />
                                    <ScrollBar x:Name="PART_VerticalScrollBar"
                                               Grid.Column="0"
                                               Grid.Row="1"
                                               Orientation="Vertical"
                                               Value="{TemplateBinding VerticalOffset}"
                                               Maximum="{TemplateBinding ScrollableHeight}"
                                               ViewportSize="{TemplateBinding ViewportHeight}"
                                               Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" />
                                    <ScrollBar x:Name="PART_HorizontalScrollBar"
                                               Grid.Column="1"
                                               Grid.Row="0"
                                               Orientation="Horizontal"
                                               Value="{TemplateBinding HorizontalOffset}"
                                               Maximum="{TemplateBinding ScrollableWidth}"
                                               ViewportSize="{TemplateBinding ViewportWidth}"
                                               Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" />
                                </Grid>
                            </ControlTemplate>
                        </ScrollViewer.Template>
                        <ItemsPresenter />
                    </ScrollViewer>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<DataGrid Style="{StaticResource MergedCellDataGridStyle}" ...>
    <!-- DataGrid的列定义和数据绑定等 -->
</DataGrid>