I want add tooltip in textblock but could not able to do that

   <DataGrid.Columns>
                <DataGridTemplateColumn Width="*">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width=".5*"/>
                                    <ColumnDefinition Width=".5*"/>
                                </Grid.ColumnDefinitions>
                                <TextBlock Text="{Binding Name}" Width="100" HorizontalAlignment="Center" VerticalAlignment="Center">
                                    <TextBlock.Style>
                                        <Style TargetType="TextBlock">
                                            <Setter Property="ToolTip" Value="{Binding Name}" />
                                        </Style>
                                    </TextBlock.Style>
                                </TextBlock>
                                <Border Grid.Column="1" BorderThickness="0.5" BorderBrush="Black"  HorizontalAlignment="Left" VerticalAlignment="Center" >
                                    <TextBlock Text="{Binding Id, FallbackValue=???,UpdateSourceTrigger=PropertyChanged}" FontSize="13" Margin="10 0" Width="120" Height="24"   HorizontalAlignment="Stretch" VerticalAlignment="Center"/>
                                </Border>
                            </Grid>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>

Here is my XAML and this datagrid also comes under groupbox . I have tried many approach but couldnt figure it out . I want tooltip for textblock for name