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RadTreeViewItem with custom template doesn't work with drag and drop

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mrhaze asked on 17 Jun 2011, 07:23 AM

When using a custom RadTreeViewItem template (Blend -> Edit Template -> Edit a Copy) drag and drop throws an exception after a few movements in the RadTreeView:

Exception: InvalidOperationException

Message : A VirtualizingPanel is not nested in an ItemsControl. VirtualizingPanel must be nested in ItemsControl to get and show items.

Stack trace:

vid System.Windows.Controls.VirtualizingPanel.getGenerator()

vid System.Windows.Controls.VirtualizingPanel.get_ItemContainerGenerator()

vid Telerik.Windows.Controls.TreeView.TreeViewPanel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)

vid System.Windows.Controls.VirtualizingPanel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)

vid System.Windows.Controls.VirtualizingPanel.OnItemsChangedHandler(Object sender, ItemsChangedEventArgs args)

vid System.Windows.Controls.Primitives.ItemsChangedEventHandler.Invoke(Object sender, ItemsChangedEventArgs e)

vid System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index, Boolean suppressEvent)

vid System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

vid System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

vid System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

vid System.Windows.Controls.ItemCollection.NotifyCollectionChanged(NotifyCollectionChangedEventArgs e)

vid System.Windows.Controls.ItemCollection.InsertImpl(Int32 index, Object value)

vid System.Windows.PresentationFrameworkCollection`1.System.Collections.IList.Insert(Int32 index, Object value)

vid Telerik.Windows.Controls.RadTreeView.EndDrop(FrameworkElement dropTarget, IEnumerable draggedItemsEnumerable)

vid Telerik.Windows.Controls.RadTreeView.OnDropComplete(FrameworkElement dropDestination, IEnumerable draggedItems)

vid Telerik.Windows.Controls.RadTreeView.OnTreeViewDropInfo(Object sender, DragDropEventArgs e)

vid Telerik.Windows.Controls.DragDrop.DragDropEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)

vid Telerik.Windows.RadRoutedEventArgs.InvokeHandler(Delegate handler, Object target)

vid Telerik.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RadRoutedEventArgs routedEventArgs)

vid Telerik.Windows.EventRoute.InvokeHandlersImpl(Object source, RadRoutedEventArgs args, Boolean raisedAgain)

vid Telerik.Windows.RadRoutedEventHelper.RaiseEvent(DependencyObject element, RadRoutedEventArgs args)

vid Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.DragDropProvider_DropInfo(Object sender, DragDropEventArgs e)

vid Telerik.Windows.Controls.DragDrop.DragDropProviderBase.RaiseDropInfo()

vid Telerik.Windows.Controls.DragDrop.SilverlightDragDropProvider.OnDrop()

vid Telerik.Windows.Controls.DragDrop.SimulatedDragDropProvider.OnCoverRectangleMouseLeftButtonUpInternal()

vid Telerik.Windows.Controls.DragDrop.SilverlightDragDropProvider.OnCoverRectangleMouseLeftButtonUp(Object sender, EventArgs e)

vid MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)

vid MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

9 Answers, 1 is accepted

Accepted

answered on 27 Jun 2011, 03:01 PM

Hi mrhaze,

This appears to be a bug in the RadTreeView. We logged it i our PITS (where you can track its status) and updated your telerik account points as a thanks for your cooperation. As a workaround, you can set a x:Key to this Style and apply it explicitly to every RadTreeViewItem defined in XAML.

All the best,
Petar Mladenov
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

answered on 05 Apr 2012, 05:05 AM

We are running into the same issue with the RadTree and were wondering if you guys can either fix this or share with us a workaround. Here is the stack trace when we hit this issue:

(Name='tbFilter'); target property is 'Text' (type 'System.String').. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: A VirtualizingPanel is not nested in an ItemsControl. VirtualizingPanel must be nested in ItemsControl to get and show items.

at System.Windows.Controls.VirtualizingPanel.getGenerator()

at System.Windows.Controls.VirtualizingPanel.get_ItemContainerGenerator()

at Telerik.Windows.Controls.TreeView.TreeViewPanel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.VirtualizingPanel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.VirtualizingPanel.OnItemsChangedHandler(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.Primitives.ItemsChangedEventHandler.Invoke(Object sender, ItemsChangedEventArgs e)

at System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index, Boolean suppressEvent)

at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at System.Windows.Controls.ItemCollection.NotifyCollectionChanged(NotifyCollectionChangedEventArgs e)

at System.Windows.Controls.ItemCollection.System.Windows.Controls.ICollectionChangedListener.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at System.Windows.Controls.WeakCollectionChangedListener.SourceCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)

at System.Collections.ObjectModel.Collection`1.Add(T item)

at Synapse.Silverlight.UtilizationSnapshot.ViewModels.FilterSelectorForTreeViewModel.Filter(Object parameter)

at Synapse.Silverlight.UtilizationSnapshot.ViewModels.FilterSelectorForTreeViewModel.set_FilterText(String value)

--- End of inner exception stack trace ---

at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)

at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)

at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)

at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)

at System.Windows.CLRPropertyListener.set_Value(Object value)

at System.Windows.PropertyAccessPathStep.set_Value(Object value)

at System.Windows.Data.BindingExpression.UpdateValue().