WPF 4 中DataGrid的模板列做双向数据绑定

　　

WPF 4 中DataGrid的模板列做双向数据绑定时，需要在绑定中指定UpdateSourceTrigger，如下：（WPFToolkit February 2010）

<DataGrid VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling" 
Name="dataGrid1" AutoGenerateColumns="False" ItemsSource="{Binding}" HorizontalGridLinesBrush=
"{DynamicResource GridLinesBrush}" VerticalGridLinesBrush="{DynamicResource GridLinesBrush}"
 AlternatingRowBackground="{DynamicResource RowBackgroundBrush}" CanUserAddRows="False" 
CanUserResizeRows="False" CanUserDeleteRows="False" IsEnabled="True" Margin="0" RowHeight="20" 
 CellStyle="{DynamicResource DataGridCellStyle2}" ColumnHeaderStyle="{DynamicResource DataGridColumnHeaderStyle1}" 
RowStyle="{DynamicResource DataGridRowStyle1}" RowHeaderStyle="{DynamicResource DataGridRowHeaderStyle1}" 
ItemsPanel="{DynamicResource ItemsPanelTemplate1}" RowHeaderWidth="0" IsSynchronizedWithCurrentItem="True"
 SelectionMode="Single" MinWidth="10" BorderThickness="0" GridLinesVisibility="Horizontal" ColumnHeaderHeight="22"
 ScrollViewer.CanContentScroll="False" >
  <DataGrid.Columns>
    <DataGridTemplateColumn Header="选择" CanUserReorder="False">
      <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
          <CheckBox IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Cursor="Hand"/>
        </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
    <DataGridTextColumn Header="标题" Binding="{Binding Title, Mode=OneWay}" />
  </DataGrid.Columns>
</DataGrid>

　　IsChecked="{Binding IsChecked, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

　　WPFToolkit February 2010则不需要。