How can I get the DataTemplate-Controls of each ListBoxItem?

Question

Hello!

I have a ListBox with a DataTemplate. In the DataTemplate is a grid with a checkbox and a Textblock Control. Now I would like to, that when I click on a button the TextBlock color change to red for the first and the third item for e.g.!

Here is my Listbox-XAML:

<ListBox x:Name="lstAntworten" Margin="10,10,0,55" Grid.Row="1" BorderThickness="0" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ItemContainerStyle="{StaticResource ListBox_NoSelectionColor}" OpacityMask="#FFFEFEFE" Background="Transparent" Width="500" HorizontalAlignment="Left" d:LayoutOverrides="Width">
            
            <ListBox.ItemTemplate>
                <DataTemplate>
			<Grid x:Name="grdContent" ShowGridLines="False" Margin="0, 15, 0, 0">
	                        <Grid.RowDefinitions>
	                           
	                            
	                        </Grid.RowDefinitions>

	                        <Grid.ColumnDefinitions>
	                            <ColumnDefinition Width="50"></ColumnDefinition>
	                            <ColumnDefinition Width="*"></ColumnDefinition>
	                        </Grid.ColumnDefinitions>

	                        <CheckBox Tag="{Binding Path=ID}" IsChecked="{Binding Status, Mode=TwoWay}" x:Name="chkStatus" Grid.Column="0" Margin="15, 0, 20, 0" HorizontalAlignment="Center" VerticalAlignment="Top" />
	                        <TextBlock x:Name="txtbText" Text="{Binding Text}" FontSize="18" Margin="15, 0, 15, -5" Grid.Column="1" MouseLeftButtonUp="txtbText_MouseLeftButtonUp" />
					</Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

My question is now, how can I get the single ListBoxItems through the Button-Click, so that I can get the Textblock-Control of each ListboxItem?

Thank you in advance for your answers!

Regards

Echo6