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A DataTemplate used with a ContentControl

<UserControl x:Class='SilverlightApplication3.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" Background="White">         <Button x:Name="myButton" Height="70" Width="210">             <Button.ContentTemplate>                 <DataTemplate>                     <StackPanel Orientation="Horizontal">                         <Image Source="{Binding Icon}" Height="40" Margin="10" />                         <TextBlock Text="{Binding Name}" FontSize="20" VerticalAlignment="Center" />                     </StackPanel>                 </DataTemplate>             </Button.ContentTemplate>         </Button>     </Grid> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.ComponentModel; 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.Media.Imaging; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();             Emoticon emoticon = new Emoticon("Smiley Face", "http://server.com/smiley.png");             myButton.Content = emoticon;         }     }     public class Emoticon : INotifyPropertyChanged                                 {         public event PropertyChangedEventHandler PropertyChanged;                        private string name = string.Empty;         public string Name         {             get { return name; }             set                                                                                {                                                                                      name = value;                                                                        UpdateProperty("Name");                                                          }                                                                              }         private BitmapImage icon = null;         public BitmapImage Icon         {             get { return icon; }             set             {                 icon = value;                 UpdateProperty("Icon");             }         }         public Emoticon(string _name, string _imageUrl)         {             name = _name;             icon = new BitmapImage(new Uri(_imageUrl));         }         public void UpdateProperty(string propertyName)                                  {             if (PropertyChanged != null )             {                  PropertyChanged(this, new PropertyChangedEventArgs(propertyName));              }         }     } }