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POCustom Attribute Binding in Silverlight
 

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    <p>I've got two Silverlight Controls in my project, both have properties TeamId. I would like to bind these together in XAML in the control hosting both user controls similar to:</p> <pre><code> &lt;agChat:UserTeams x:Name="oUserTeams" /&gt; &lt;agChat:OnlineUser x:Name="oOnlineUsers" TeamId="{Binding ElementName=oUserTeams, Path=TeamId}" /&gt; </code></pre> <p>In the first control, I'm implementing System.ComponentModel.INotifyPropertyChanged and raising the PropertyChanged event upon the TeamId property changing.</p> <p>In the second control, I've used the propdp snippet to identify the TeamId as a Dependency property.</p> <pre><code> // Using a DependencyProperty as the backing store for TeamId. This enables animation, styling, binding, etc... public static readonly DependencyProperty TeamIdProperty = DependencyProperty.Register( "TeamId", typeof(string), typeof(OnlineUsers), new System.Windows.PropertyMetadata(new System.Windows.PropertyChangedCallback(TeamChanged))); </code></pre> <p>However when the silverlight controls first gets created, I get the follow exception from Silverlight:</p> <pre><code> Unhandled Error in Silverlight 2 Application Invalid attribute value {Binding ElementName=oUserTeams, Path=TeamId} for property TeamId. [Line: 21 Position: 146] at System.Windows.Application.LoadComponent(Object component, Uri xamlUri) at agChat.Page.InitializeComponent() at agChat.Page..ctor() at agChat.App.Application_Startup(Object sender, StartupEventArgs e) at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName) </code></pre> <p>Any ideas what I'm doing wrong? Obviously this could all be done in code-behind, but this <em>seems</em> like the correct approach.</p>
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