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I want to change the background of StackPanel when clicking TextBlock.

enter image description here

now background is bule! I want to change it!

<TreeView Name="tvView" HorizontalAlignment="Left" VerticalAlignment="Top" BorderThickness="0">

 <TreeView.ItemTemplate>
 <HierarchicalDataTemplate ItemsSource="Binding Path=ChildNodes">
 <Grid VerticalAlignment="Top" Margin="0">
 <StackPanel Orientation="Horizontal" d:LayoutOverrides="Height">
 <TextBlock Name="ConfidenceLevelReminderText" Text="！" FontWeight="Bold" HorizontalAlignment="Center" Foreground="#FF0000" Width="Binding Path=ConfidenceLevelWidth" Margin="0,0,0,0"></TextBlock>
 <TextBlock TextWrapping="Wrap" 
 Padding="0,3,0,3" 
 Text="Binding Path=Name" 
 ToolTip="Binding Path=NameToolTip" 
 Tag="Binding Path=TagInfo" 
 MouseLeftButtonDown="name_MouseLeftButtonDown" 
 FontSize="14" 
 VerticalAlignment="Center" 
 HorizontalAlignment="Center" 
 Foreground="#FF666666" 
 Margin="0" 
 Width="Binding Path=TextWidth" 
 Cursor="Hand"/>
 <Button x:Name="btnIngnore" Width="Binding Path=IgnoreWidth" Click="btn_ignore_Click" Tag="Binding Path=NodeId" Margin="0" BorderThickness="0" Background="x:Null" Style="StaticResource ButtonStyle32" IsEnabled="Binding Path=IgnoreWidth,Converter=StaticResource itb" Cursor="Hand">
 <TextBlock Text="xxxx" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0" FontSize="12" Foreground="#FF666666"/>
 </Button>

 </StackPanel>
 </Grid>
 </HierarchicalDataTemplate>
 </TreeView.ItemTemplate>
 </TreeView>

If you want

to change the background of StackPanel when clicking TextBlock.

You can add EventSetter to the TextBlock's Style and handle event in the event handler.

<TextBlock Text="...">
 <TextBlock.Style>
 <Style TargetType="TextBlock">
 <EventSetter Event="MouseDown" Handler="Mouse_LBtnDown"/>
 </Style>
 </TextBlock.Style>
</TextBlock>

private void Mouse_LBtnDown(object sender, MouseButtonEventArgs e)

 StackPanel stp = null;
 var visParent = VisualTreeHelper.GetParent(sender as FrameworkElement);
 while (stp == null && visParent != null)
 
 stp = visParent as StackPanel;
 visParent = VisualTreeHelper.GetParent(visParent);
 
 if (stp == null) return; 

 stp.Background = Brushes.Coral;

For make it reusable and adjustable you could make a behavior from the event handler.

If you don't want what you have asked, then rethink your question and ask new one.