获取控件值

C# code

  <sdk:DataGridTemplateColumn Header="全选"  CanUserResize="False" Width="44">                            <sdk:DataGridTemplateColumn.HeaderStyle>                                <Style TargetType="sdk:DataGridColumnHeader">                                    <Setter Property="HorizontalContentAlignment" Value="Center"></Setter>                                    <Setter Property="VerticalContentAlignment" Value="Center"></Setter>                                    <Setter Property="ContentTemplate">                                        <Setter.Value>                                            <DataTemplate>                                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">                                                    <TextBlock Text="" Width="12"/>                                                    <CheckBox Name="chkAll" Checked="chkAll_Checked" Unchecked="chkAll_Unchecked"  />                                                </StackPanel>                                            </DataTemplate>                                        </Setter.Value>                                    </Setter>                                </Style>                            </sdk:DataGridTemplateColumn.HeaderStyle>                            <sdk:DataGridTemplateColumn.CellTemplate>                                <DataTemplate>                                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">                                        <CheckBox HorizontalAlignment="Center" Name="CheckBoxOSId" Tag="{Binding}"></CheckBox>                                    </StackPanel>                                </DataTemplate>                            </sdk:DataGridTemplateColumn.CellTemplate>                        </sdk:DataGridTemplateColumn>   

代码如上，DataGrid中的HeaderStyle样式中有一个Checkbox同时页面上有一个删除按钮，点击删除按钮，根据全选CheckBox 是否选中实现批量删除
如何获取 Name="chkAll" 的 CheckBox 的值?最好有满足需求的代码供参考，谢谢

[解决办法]
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