Accessing and Identifying objects in Silverlight ItemTemplate

One simple way to identify and access objects within an ItemTemplate is to Bind the Name of the object of interest to a String variable that is passed as part of the DataContext and attach EventHanler to Loaded event. The EventHandler will then Store the objects received as sender of the event into a Dictionary keyed on the object's Name.

Here is an example With TreeView within ListBox:

<UserControl xmlns:Toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"  x:Class="silverlight.net.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
    <Grid x:Name="LayoutRoot">
        <ListBox x:Name="listBox" Margin="0,38,0,0" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <Toolkit:TreeView x:Name="{Binding}" Loaded="TreeView_Loaded" ></Toolkit:TreeView>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <Button VerticalAlignment="Top" HorizontalAlignment="Center" Content="Load TreeView Items" Click="Button_Click"/>
    </Grid>
</UserControl>

And Here is the code Behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace silverlight.net
{
    public partial class MainPage : UserControl
    {
        Dictionary<System.String, TreeView> TreeViewChildren = new Dictionary<string,TreeView>();
        List<String> ChildTreeViewNames = new List<string>();
        public MainPage()
        {
            InitializeComponent();

            List<String> ChildTreeViewNames = new List<string> { "TreeView1", "TreeView2" };
            listBox.ItemsSource = ChildTreeViewNames;

        }

        private void TreeView_Loaded(object sender, RoutedEventArgs e)
        {
            TreeViewChildren.Add((System.String)((TreeView)sender).Name, (TreeView)sender);
        }

        private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            TreeViewChildren["TreeView1"].Items.Add(new TreeViewItem() { Header = "Item1" });
            TreeViewChildren["TreeView1"].Items.Add(new TreeViewItem() { Header = "Item2" });
            TreeViewChildren["TreeView2"].Items.Add(new TreeViewItem() { Header = "Item3" });
        }
    }
}