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POdependency properties gathered in separate class
 

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    <p>My question concerns Silverlight (but I guess WPF as well).</p> <p>Basically I know, how to create dependency property in a user control and how to make it work. But what i was trying to do, and didn't succeded is: to create dependency property (or more than one) in a class, and this class will become a dependency property for my user control.</p> <p>With other words: </p> <pre><code>// my UserControl public class DPTest : UserControl { // dependency property, which type is a class, and this class will be holding other dependency properties public static readonly DependencyProperty GroupProperty = DependencyProperty.Register("Group", typeof(DPGroup), typeof(DPTest), new PropertyMetadata(new DPGroup(), OnPropertyChanged)); public DPGroup Group { get { return (DPGroup)GetValue(GroupProperty); } set { SetValue(GroupProperty, value); } } // this occurs only when property Group will change, but not when a member of property Group will change static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DPTest g = d as DPTest; // etc. } } // a class, where I want to hold my dependency properties public class DPGroup : DependencyObject { 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); } } // I would like to notify "the parent" (which means user control "DPTest" ), that member MyProperty1 has changed static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DPTest g = d as DPTest; if (g != null) g.textBox1.Text = g.Group.MyProperty1.ToString(); } } </code></pre> <p>What I want to achieve is <b>to notify (in design time in XAML) a user control <code>DPTest</code>, that member of <code>Group</code> property (<code>Group.MyProperty1</code>) changed it's value</b>. I managed to make it happen in a run-time, for example by using event handler defined in <code>DPGroup</code> class, but this doesn't work in design-time in xaml.</p> <pre><code>&lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;local:DPTest&gt; &lt;local:DPTest.Group&gt; &lt;local:DPGroup MyProperty1="2"/&gt; &lt;/local:DPTest.Group&gt; &lt;/local:DPTest&gt; &lt;/Grid&gt; </code></pre> <p>It works, but only first time, during creating tag:</p> <pre><code> &lt;local:DPGroup MyProperty1="2"/&gt; </code></pre> <p>and after this, changing value of <code>MyProperty1</code>, does not fire <code>DPTest.OnPropertyChange</code>. Probably fires <code>DBGroup.OnPropertyChanged</code>, but this of course does not notify user control <code>DPTest</code> about it. <b>So how to make <code>DPTest</code> know, that the <code>Group.MyProperty1</code> has changed?</b></p> <p>I don't want to make any bindings from <code>MyProperty1</code> to respective property created inside user control <code>DPTest</code> (not to duplicate properties), the point is to have a group of properties in separate class, so i can use this group more than once, like:</p> <pre><code>// my UserControl public class DPTest : UserControl { public DPGroup Group1 { ... } public DPGroup Group2 { ... } } </code></pre> <p>I see some analogy to <code>UIElement.RenderTransform</code> (let's say it is my <code>Group</code> property) which holds for example <code>ScaleTransform</code></p> <pre><code>&lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;Grid.RenderTransform&gt; &lt;ScaleTransform ScaleX="0.4"/&gt; &lt;/Grid.RenderTransform&gt; &lt;/Grid&gt; </code></pre> <p><code>ScaleX</code> is an analogy to <code>MyProperty1</code>. <b>The difference is, that changing value of <code>ScaleX</code> (in XAML) will reflect immediate changes in design-time, and exactly this I am trying to achieve.</b></p> <p>I was trying to find a solution in entire google/stack overflow and others, but none found. Everywhere are just examples of creating dependency properties inside a user control.</p> <p>Thank you for your time. Any help much appreciated.</p> <p>edit: based on Harlow Burgess answer, a managed to make a working example in Silverlight. I put the whole solution below as an separate answer.</p>
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