public class CachedContentPresenter : ContentPresenter
        private static IDictionary<Type, Func<Control>> _factory = new Dictionary<Type, Func<Control>>();
        private readonly IDictionary<Type, Control> _cache = new Dictionary<Type, Control>();
        public static void Register(Type type, Func<Control> create) => _factory[type] = create;
        public CachedContentPresenter()
            this.GetObservable(DataContextProperty).Subscribe((value) => SetContent(value));
        public Control GetControl(Type type)
            Control control;
            _cache.TryGetValue(type, out control);
            if (control == null)
                Func<Control> createInstance;
                _factory.TryGetValue(type, out createInstance);
                control = createInstance?.Invoke();
                if (control != null)
                    _cache[type] = control;
                    throw new Exception($"Can not find factory method for type: {type}");
            return control;
        public void SetContent(object value)
            Control control = null;
            if (value != null)
                control = GetControl(value.GetType());
            if (control != null)
                var vp = control.GetVisualParent();
                if (vp != null)
                    System.Diagnostics.Debug.WriteLine($"vp is set {vp.GetType()}");
                    System.Diagnostics.Debug.WriteLine("vp is null");
                this.Content = control;
            catch (Exception ex)
                System.Diagnostics.Debug.WriteLine(ex.Message);
Xaml:
<presenters:CachedContentPresenter DataContext="{Binding Project.CurrentContainer.CurrentShape}"/>




    

          
@grokys  I have made a test with following Xaml being cached:
    <StackPanel>
        <TextBlock Text="Hello from Path" Classes="default"></TextBlock>
        <ListBox>
            <ListBoxItem>Path</ListBoxItem>
        </ListBox>
        <TabControl Classes="default">
            <TabItem Header="Path" Classes="property">
                <TextBlock Text="Hello from TabItem Path" Classes="default"></TextBlock>
            </TabItem>
        </TabControl>
    </StackPanel>
and after few times that everything got rendered only first TextBlock is rendered again.
Video: https://files.gitter.im/AvaloniaUI/Avalonia/yh1X/2016-07-11_22-17-14.mp4
          
Looks like the issue may be connected to virtualization.
Changed ListBox panel to StackPanel and the ListBox control is not rendered after few times, but ListBoxItem is rendered always!
    <StackPanel Background="Yellow">
        <TextBlock Text="Hello from Path" Classes="default"></TextBlock>
        <Rectangle Width="100" Height="50" Fill="Orange"/>
        <ListBox Name="listBox" Background="Red" VirtualizationMode="Simple">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Vertical"/>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBoxItem>Path</ListBoxItem>
        </ListBox>
    </StackPanel>




    

If I change VirtualizationMode to none I get after few times this exception:
Exception thrown: 'System.NullReferenceException' in Avalonia.Controls.dll
Core2D.Avalonia.Skia.vshost.exe Error: 0 : Odwołanie do obiektu nie zostało ustawione na wystąpienie obiektu.
   w Avalonia.Controls.Presenters.ItemVirtualizer.Dispose()
   w Avalonia.Controls.Presenters.ItemsPresenter.VirtualizationModeChanged(AvaloniaPropertyChangedEventArgs e)
   w Avalonia.AvaloniaObjectExtensions.SubscribeAdapter[TTarget](AvaloniaPropertyChangedEventArgs e, Func`2 handler)
   w Avalonia.AvaloniaObjectExtensions.<>c__DisplayClass8_0`1.<AddClassHandler>b__0(AvaloniaPropertyChangedEventArgs e)
   w System.Reactive.AnonymousObserver`1.OnNextCore(T value)
   w System.Reactive.ObserverBase`1.OnNext(T value)
   w System.Reactive.Subjects.Subject`1.OnNext(T value)
   w Avalonia.AvaloniaObject.RaisePropertyChanged(AvaloniaProperty property, Object oldValue, Object newValue, BindingPriority priority)
   w Avalonia.AvaloniaObject.Avalonia.IPriorityValueOwner.Changed(PriorityValue sender, Object oldValue, Object newValue)
   w Avalonia.PriorityValue.UpdateValue(Object value, Int32 priority)
   w Avalonia.PriorityValue.LevelValueChanged(PriorityLevel level)
   w Avalonia.PriorityLevel.ActivateFirstBinding()
   w Avalonia.PriorityLevel.Changed(PriorityBindingEntry entry)
   w Avalonia.PriorityBindingEntry.ValueChanged(Object value)
   w System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
   w System.Reactive.Linq.ObservableImpl.Select`2._.OnNext(TSource value)
   w System.Reactive.AutoDetachObserver`1.OnNextCore(T value)
   w System.Reactive.ObserverBase`1.OnNext(T value)
   w System.Reactive.SafeObserver`1.OnNext(TSource value)
   w System.Reactive.Linq.ObservableImpl.TakeUntil`2._.T.OnNext(TSource value)
   w System.Reactive.Subjects.Subject`1.OnNext(T value)
   w Avalonia.Markup.Data.ExpressionNode.set_CurrentValue(WeakReference value)
   w Avalonia.Markup.Data.ExpressionNode.set_Target(WeakReference value)
   w Avalonia.Markup.Data.ExpressionObserver.<IncrementCount>b__27_0(Unit x)
   w System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
   w System.Reactive.Linq.ObservableImpl.Select`2._.OnNext(TSource value)
   w System.Reactive.Linq.ObservableImpl.Skip`1._.OnNext(TSource value)
   w System.Reactive.Linq.ObservableImpl.Cast`2._.OnNext(TSource value)
   w System.Reactive.AutoDetachObserver`1.OnNextCore(T value)
   w System.Reactive.ObserverBase`1.OnNext(T value)
   w Avalonia.AvaloniaObjectExtensions.<>c__DisplayClass0_1.<GetObservable>b__1(Object s, AvaloniaPropertyChangedEventArgs e)
   w System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   w Avalonia.AvaloniaObject.RaisePropertyChanged(AvaloniaProperty property, Object oldValue, Object newValue, BindingPriority priority)
   w Avalonia.AvaloniaObject.Avalonia.IPriorityValueOwner.Changed(PriorityValue sender, Object oldValue, Object newValue)
   w Avalonia.PriorityValue.UpdateValue(Object value, Int32 priority)
   w Avalonia.PriorityValue.LevelValueChanged(PriorityLevel level)
   w Avalonia.PriorityLevel.set_DirectValue(Object value)
   w Avalonia.AvaloniaObject.SetValue(AvaloniaProperty property, Object value, BindingPriority priority)
   w Avalonia.AvaloniaObject.SetValue[T](AvaloniaProperty`1 property, T value, BindingPriority priority)
   w Avalonia.Controls.Mixins.ContentControlMixin.<>c__DisplayClass1_0`1.<Attach>b__3(AvaloniaPropertyChangedEventArgs e)
   w System.Reactive.AnonymousObserver`1.OnNextCore(T value)
   w System.Reactive.ObserverBase`1.OnNext(T value)
   w System.Reactive.Observer`1.OnNext(T value)
   w System.Reactive.Subjects.Subject`1.OnNext(T value)
   w Avalonia.AvaloniaObject.RaisePropertyChanged(AvaloniaProperty property, Object oldValue, Object newValue, BindingPriority priority)
   w Avalonia.AvaloniaObject.ParentPropertyChanged(Object sender, AvaloniaPropertyChangedEventArgs e)
   w System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   w Avalonia.AvaloniaObject.RaisePropertyChanged(AvaloniaProperty property, Object oldValue, Object newValue, BindingPriority priority)
   w Avalonia.AvaloniaObject.Avalonia.IPriorityValueOwner.Changed(PriorityValue sender, Object oldValue, Object newValue)
   w Avalonia.PriorityValue.UpdateValue(Object value, Int32 priority)
   w Avalonia.PriorityValue.LevelValueChanged(PriorityLevel level)
   w Avalonia.PriorityLevel.set_DirectValue(Object value)
   w Avalonia.AvaloniaObject.SetValue(AvaloniaProperty property, Object value, BindingPriority priority)
   w Avalonia.Controls.Control.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Control.Avalonia.LogicalTree.ILogical.NotifyDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Primitives.TemplatedControl.OnDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Control.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Control.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Control.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e)
   w Avalonia.Controls.Control.Avalonia.Controls.ISetLogicalParent.SetParent(ILogical parent)
   w Avalonia.Controls.Control.ClearLogicalParent(IEnumerable`1 children)
   w Avalonia.Controls.Control.LogicalChildrenCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   w Avalonia.Collections.AvaloniaList`1.NotifyRemove(IList t, Int32 index)
   w Avalonia.Collections.AvaloniaList`1.Remove(T item)
   w Avalonia.Controls.Presenters.ContentPresenter.UpdateChild()
   w Avalonia.Controls.Presenters.ContentPresenter.ApplyTemplate()
   w Avalonia.Layout.Layoutable.MeasureCore(Size availableSize)
   w Avalonia.Layout.Layoutable.Measure(Size availableSize)
   w Avalonia.Layout.LayoutManager.Measure(ILayoutable control)
   w Avalonia.Layout.LayoutManager.ExecuteMeasurePass()
   w Avalonia.Layout.LayoutManager.ExecuteLayoutPass()
   w Avalonia.Threading.JobRunner.RunJobs()
   w Avalonia.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
   w Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg)
   w Avalonia.Win32.Win32Platform.RunLoop(CancellationToken cancellationToken)
   w Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken)
   w Avalonia.Application.Run(ICloseable closable)
   w Core2D.Avalonia.App.Start(IFileSystem fileIO, ILog log, ImmutableArray`1 writers) w C:\DOWNLOADS\GitHub-Core2D\Core2D\src\Core2D.Avalonia\App.xaml.cs:wiersz 181
          
    <StackPanel Background="Yellow">
        <TextBlock Text="Hello from Path" Classes="default"></TextBlock>
        <Rectangle Width="100" Height="50" Fill="Orange"/>
        <ListBox Name="listBox" Background="Red" VirtualizationMode="Simple">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <Panel Background="Green"/>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBoxItem Background="Purple">Path</ListBoxItem>
        </ListBox>
    </StackPanel>
Using above Xaml: the ListBox is part of visual and logical tree, but its not rendered:

          
@wieslawsoltes have ben trying to look into this, but i'm unable to work out what a repro would look like in a sample project. Also i'm hoping #1032 might have fixed it. Was wondering if when you get a moment you could try it with latest Avalonia CI build and if it's still a problem, explain how to do a minimal repro?