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Bug on docking binding with MVVM and MEF

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This is a migrated thread and some comments may be shown as answers.
ricky wu
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ricky wu asked on 16 Mar 2010, 04:49 PM
Core code:
C# code behind:
    public Mainpage(){
        this.datacontext = viewModel;
    public MainPageViewModel ViewModel{get;set;}
C# ViewModel :
   public MainPageViewModel(){
    TopWidgets = new Obserablecollection<RadPane>();
    public Obserablecollection<RadPane> TopWidgets{get;set;}
   void TriggerRadPaneLoaded(){
        TopWidgets.Add(new RadPane(){ header=" topPane"}
        <telerikcontrol:RadPaneGroup itemsSource = "{Binding TopWidgets}"/>
After I loaded the RadPane through viewmodel, Every thing is find because i manipulate the collection in the view model. However, there is a exception when I try to drag the pane to re locate it. I assumed the relocate the radpane also manipulate the binding property which is TopWidgets. But it is not.
 at System.Windows.Controls.ItemCollection.RemoveImpl(Object value)
   at System.Windows.Controls.ItemCollection.RemoveInternal(Object value)
   at System.Windows.PresentationFrameworkCollection`1.Remove(T value)
   at Telerik.Windows.Controls.RadPaneGroup.RemovePane(RadPane pane)
   at Telerik.Windows.Controls.RadPane.RemoveFromParent()
   at Telerik.Windows.Controls.RadDocking.MoveItems(RadTabControl source, RadTabControl destination)
   at Telerik.Windows.Controls.RadDocking.OpenInToolWindow(RadPaneGroup radPaneGroup)
   at Telerik.Windows.Controls.RadDocking.ShowElement(DragInfoEventArgs e)
   at Telerik.Windows.Controls.RadDocking.OnDragDelta(Object sender, DragInfoEventArgs e)
   at Telerik.Windows.Controls.Docking.DragInfoEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)
   at Telerik.Windows.RouteItem.InvokeHandler(RadRoutedEventArgs routedEventArgs)
   at Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)
   at Telerik.Windows.EventRoute.InvokeHandlers(Object source, RadRoutedEventArgs args)
   at Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)
   at Telerik.Windows.DependencyObjectExtensions.RaiseEvent(DependencyObject element, RadRoutedEventArgs e)
   at Telerik.Windows.Controls.Docking.DragDropHelper.DragDelta(UIElement target, UIElement dragRoot, MouseEventArgs e)
   at Telerik.Windows.Controls.Docking.DragDropHelper.DragDelta(UIElement target, MouseEventArgs e)
   at Telerik.Windows.Controls.Docking.PaneHeader.OnMouseMove(MouseEventArgs e)
   at System.Windows.Controls.Control.OnMouseMove(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)    


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Telerik team
answered on 18 Mar 2010, 05:18 PM
Hello ricky wu,

Using ItemsSource with RadDocking is not supported. You should manually create RadPanes and add them to the RadPaneGroup.Items collection.

All the best,
the Telerik team

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ricky wu
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