wpfDataGrid标题栏增加CheckBox全选

<DataGridTemplateColumn Width="50" CanUserResize="False">
                    <DataGridTemplateColumn.HeaderTemplate>
                        <DataTemplate>
                            <CheckBox
                                Margin="5,0,5,0"
                                IsChecked="{Binding DataContext.IsSelectAll, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}"
                                Style="{StaticResource CheckBox.MapToolBar.Style}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.HeaderTemplate>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <CheckBox
                                Margin="5,0,5,0"
                                IsChecked="{Binding IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                Style="{StaticResource CheckBox.MapToolBar.Style}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                    <DataGridTemplateColumn.CellStyle>
                        <Style TargetType="DataGridCell">
                            <Setter Property="VerticalAlignment" Value="Center" />
                            <Setter Property="HorizontalAlignment" Value="Left" />
                            <Setter Property="Margin" Value="2,0,0,0" />
                            <Style.Triggers>
                                <Trigger Property="IsSelected" Value="True">
                                    <Setter Property="Background" Value="Transparent" />
                                    <Setter Property="BorderBrush" Value="Transparent" />
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </DataGridTemplateColumn.CellStyle>
                </DataGridTemplateColumn>

DataGrid增加CheckBox栏