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I have TreeView control and I want to bind tree nodes' IsExpanded property to my DataSource items! But I have an exception: System.Windows.Markup.XamlParseException occurred Message=Set property '' threw an exception. StackTrace: at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at SilverlightTree.BSTreeView.InitializeComponent() at SilverlightTree.BSTreeView..ctor() InnerException: System.NotSupportedException Message=Cannot set read-only property ''. StackTrace: at MS.Internal.XamlMemberInfo.SetValue(Object target, Object value) at MS.Internal.XamlManagedRuntimeRPInvokes.SetValue(XamlTypeToken inType, XamlQualifiedObject& inObj, XamlPropertyToken inProperty, XamlQualifiedObject& inValue) InnerException: inner exception: {System.NotSupportedException: Cannot set read-only property ''. XAML: <Grid x:Name="LayoutRoot"> <controls:TreeView Name="treeView" SelectedItemChanged="treeView_SelectedItemChanged" Style="{Binding TreeViewConnectingLines}" BorderBrush="{x:Null}"> <controls:TreeView.ItemTemplate> <toolkit:HierarchicalDataTemplate ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal" Background="Transparent"> <toolkitDrag:ContextMenuService.ContextMenu> <toolkitDrag:ContextMenu Loaded="ContextMenu_Loaded" Opened="ContextMenu_Opened"/> </toolkitDrag:ContextMenuService.ContextMenu> <Image Source="{Binding Path=Type.Icon}" Width="20" Height="20" /> <TextBlock Text="{Binding Path=FullDescription}" Height="20"

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