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    copied!<p>After a quick test your code seems to work fine.</p> <p>My test:</p> <p>xaml:</p> <pre><code> &lt;Window x:Class="WpfApplication4.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication4" xmlns:Controls="clr-namespace:Liz.Common" Title="MainWindow" Height="300" Width="400" Name="UI" &gt; &lt;Window.Resources&gt; &lt;DataTemplate x:Key="removableTalentListTemplate"&gt; &lt;StackPanel&gt; &lt;TextBlock FontSize="13" Text="{Binding Path=tName}" VerticalAlignment="Center" Width="175" Height="18" Grid.Column="0" &gt; &lt;TextBlock.ToolTip&gt; &lt;ToolTip Background="Blue"&gt; &lt;StackPanel&gt; &lt;TextBlock Text="{Binding Path=Description}" Foreground="White" /&gt; &lt;/StackPanel&gt; &lt;/ToolTip&gt; &lt;/TextBlock.ToolTip&gt; &lt;/TextBlock&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;ListBox ItemTemplate="{StaticResource removableTalentListTemplate}" ItemsSource="{Binding ElementName=UI, Path=Models}" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>Code:</p> <pre><code>public partial class MainWindow : Window { private ObservableCollection&lt;MyModel&gt; _models = new ObservableCollection&lt;MyModel&gt;(); public MainWindow() { InitializeComponent(); Models.Add(new MyModel { tName = "Test", Description = "Hello" }); } public ObservableCollection&lt;MyModel&gt; Models { get { return _models; } set { _models = value; } } } public class MyModel : INotifyPropertyChanged { private string _tName; private string _description; public string tName { get { return _tName; } set { _tName = value; NotifyPropertyChanged("tName"); } } public string Description { get { return _description; } set { _description = value; NotifyPropertyChanged("Description"); } } public event PropertyChangedEventHandler PropertyChanged; private void NotifyPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } } </code></pre> <p>result: <img src="https://i.stack.imgur.com/QOlK4.png" alt="enter image description here"></p>
 

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