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    <p>Ok, so based on @Harlow Burgess answer, a managed to make a working example in Silverlight.</p> <p>Basically the difference is, that in SL, <code>DependencyObject</code> class has no <code>OnPropertyChanged</code> method, so in <code>DPGroup</code> class we cannot override it, but we can attach this method in another way, by: </p> <pre><code>new PropertyMetadata(1, OnPropertyChanged). </code></pre> <p>So the <code>DPGroup</code> class will look like this:</p> <pre><code>public class DPGroup : DependencyObject, INotifyPropertyChanged { public static readonly DependencyProperty MyProperty1Property = DependencyProperty.RegisterAttached( "MyProperty1", typeof(int), typeof(DPGroup), new PropertyMetadata(1, OnPropertyChanged)); public int MyProperty1 { get { return (int)GetValue(MyProperty1Property); } set { SetValue(MyProperty1Property, value); } } // static method invoked when MyProperty1 has changed value static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DPGroup g = d as DPGroup; if (g != null) { g.MyProperty1 = (int)e.NewValue; // invoking event handler, to notify parent class about changed value of DP if (g.PropertyChanged != null) g.PropertyChanged(g, null); } } // event handler, for use in parent class public event PropertyChangedEventHandler PropertyChanged; } </code></pre> <p>And the parent class, containing dependency property of type <code>DPGroup</code>:</p> <pre><code>public partial class DPTest : UserControl { public static readonly DependencyProperty GroupProperty = DependencyProperty.Register( "Group", typeof(DPGroup), typeof(DPTest), new PropertyMetadata( new DPGroup(), new PropertyChangedCallback(OnGroupPropertyChanged) ) ); public DPGroup Group { get { return (DPGroup)GetValue(GroupProperty); } set { SetValue(GroupProperty, value); } } // static method invoked when Group property has changed value // here we need to attach event handler defined if DPGroup, so it will fire from inside Group property, // when Group.MyProperty1 will change value static void OnGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DPTest control = (DPTest)d; DPGroup oldGroup = e.OldValue as DPGroup; // removing event handler from prevoius instance of DBGroup if (oldGroup != null) oldGroup.PropertyChanged -= new PropertyChangedEventHandler(control.group_PropertyChanged); DPGroup newGroup = e.NewValue as DPGroup; // adding event handler to new instance of DBGroup if (newGroup != null) newGroup.PropertyChanged += new PropertyChangedEventHandler(control.group_PropertyChanged); DPTest g = d as DPTest; if (g != null) control.UpdateTextBox(); } private void group_PropertyChanged(object sender, PropertyChangedEventArgs e) { UpdateTextBox(); } // here you can do anything with changed value Group.MyProperty1 private void UpdateTextBox() { this.textBox1.Text = this.Group.MyProperty1.ToString(); } public DPTest() { InitializeComponent(); } } </code></pre> <p>Now, the XAML part for <code>DPTest</code>:</p> <pre><code>&lt;UserControl x:Class="Silverlight_Workbench_2.DPTest" 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" xmlns:local="clr-namespace:Silverlight_Workbench_2" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400" &gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;TextBox Height="23" HorizontalAlignment="Left" Margin="76,61,0,0" x:Name="textBox1" VerticalAlignment="Top" Width="120" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>Finally, we can embed our <code>DPTest</code> in some content of any control, for example in a <code>Grid</code> of another user control:</p> <pre><code>&lt;UserControl x:Class="Silverlight_Workbench_2.DPTestMain" 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" xmlns:local="clr-namespace:Silverlight_Workbench_2" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"&gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;local:DPTest&gt; &lt;local:DPTest.Group&gt; &lt;!--here we can change value, and it will be reflected in design window as a text in textBox1--&gt; &lt;local:DPGroup MyProperty1="8"/&gt; &lt;/local:DPTest.Group&gt; &lt;/local:DPTest&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>That is all, thanks again to the Harlow Burgess for the help!</p>
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