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。