retrieving the content properties from data template in wpf - wpf

Question

I have a particular template for a listbox item which contains different textblocks. After adding the items in the listbox I want to retrieve the text of a particular textblock of a particular listbox item. How can I do that?
<ListBox x:Name="listBox1" Grid.Row="0" SelectionChanged="listBox1_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,2,0,0">
<CheckBox Name="cbSelect" VerticalAlignment="Center" Visibility="{Binding isVisible}"/>
<StackPanel Orientation="Vertical">
<Grid HorizontalAlignment="Stretch" >
<TextBlock Name="txtTitle" VerticalAlignment="Bottom" Text="{Binding Title}" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Name="txtDate" Foreground="{StaticResource PhoneInverseInactiveBrush}" HorizontalAlignment="Right" VerticalAlignment="Center" Text="{Binding CreatedOn}" Margin="0,0,30,0" Style="{StaticResource PhoneTextSmallStyle}" />
<!-- <Image x:Name="lineImg" Source="/Icons/appbar.next.rest.png" HorizontalAlignment="Right" VerticalAlignment="Bottom" Width="48" Height="48"/>-->
</Grid>
<TextBlock Name="txtContent" Foreground="{StaticResource PhoneDisabledBrush}" VerticalAlignment="Bottom" Text="{Binding Content}" Style="{StaticResource PhoneTextNormalStyle}" />
<Line Stroke="{StaticResource PhoneBorderBrush}" StrokeThickness=" 2" X1="0" Y1="0" X2="{Binding ElementName=listBox1, Path=ActualWidth}" Y2="0" Margin="0,6,0,0" ></Line>
<!-- <Image x:Name="lineImg" Source="/Icons/Line.png" HorizontalAlignment="Center" Width="500" Height="2" Margin="0,15,0,0" />-->
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
In the above code, after adding the items to the listbox, I want the text of txtTitle of a particular item. How can I get it?

Answer 1

You need to get a reference to the ContentPresenter of the item.
ListBoxItem myListBoxItem = (ListBoxItem)(myListBox.ItemContainerGenerator.ContainerFromItem(myListBox.Items.CurrentItem));
ContentPresenter myContentPresenter = FindVisualChild<ContentPresenter>(myListBoxItem);
DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;
TextBlock myTextBlock = (TextBlock)myDataTemplate.FindName("textBlock", myContentPresenter);
The FindVisualChild method along with the full example can be found here.