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    <p>You want something like this:</p> <p>First <code>VisualWrapper</code> class:</p> <pre><code>[ContentProperty("Child")] public class VisualWrapper : FrameworkElement { public Visual Child { get { return _child; } set { if (_child != null) { RemoveVisualChild(_child); } _child = value; if (_child != null) { AddVisualChild(_child); } } } protected override Visual GetVisualChild(int index) { if (_child != null &amp;&amp; index == 0) { return _child; } else { throw new ArgumentOutOfRangeException("index"); } } protected override int VisualChildrenCount { get { return _child != null ? 1 : 0; } } private Visual _child; } </code></pre> <p>And then <code>VisualTargetPresentationSource</code>:</p> <pre><code>public class VisualTargetPresentationSource : PresentationSource { public VisualTargetPresentationSource(HostVisual hostVisual) { _visualTarget = new VisualTarget(hostVisual); } public override Visual RootVisual { get { return _visualTarget.RootVisual; } set { Visual oldRoot = _visualTarget.RootVisual; // Set the root visual of the VisualTarget. This visual will // now be used to visually compose the scene. _visualTarget.RootVisual = value; // Tell the PresentationSource that the root visual has // changed. This kicks off a bunch of stuff like the // Loaded event. RootChanged(oldRoot, value); // Kickoff layout... UIElement rootElement = value as UIElement; if (rootElement != null) { rootElement.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity)); rootElement.Arrange(new Rect(rootElement.DesiredSize)); } } } protected override CompositionTarget GetCompositionTargetCore() { return _visualTarget; } public override bool IsDisposed { get { // We don't support disposing this object. return false; } } private VisualTarget _visualTarget; } </code></pre> <p>This in your XAML:</p> <pre><code>&lt;Window x:Class="TestWpfApp.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:testWpfApp="clr-namespace:TestWpfApp" Title="MainWindow" Height="350" Width="525" xmlns:vw="--NamespaceHere--"&gt; &lt;Grid&gt; &lt;testWpfApp:GifImage x:Name="gifImage" Stretch="None" GifSource="/loading.gif" AutoStart="True" Width="50" Height="50" Margin="0,0,300,0"/&gt; &lt;ComboBox Width="200" Height="40" Name="Cb"&gt;&lt;/ComboBox&gt; &lt;vw:VisualWrapper Height="160" Width="160" VerticalAlignment="Center" HorizontalAlignment="Center" x:Name="visualWrapper" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>Then <code>LoadingPanel</code> class:</p> <pre><code>public class LoadingPanel { private VisualWrapper.VisualWrapper visualWrapper; public LoadingPanel(VisualWrapper.VisualWrapper _visualWrapper) { visualWrapper = _visualWrapper; } public VisualWrapper.VisualWrapper VisualWrapper { get { return visualWrapper; } set { visualWrapper = value; } } #region WaitDailog public HostVisual CreateMediaElementOnWorkerThread() { // Create the HostVisual that will "contain" the VisualTarget // on the worker thread. HostVisual hostVisual = new HostVisual(); // Spin up a worker thread, and pass it the HostVisual that it // should be part of. Thread thread = new Thread(new ParameterizedThreadStart(MediaWorkerThread)); thread.SetApartmentState(ApartmentState.STA); thread.IsBackground = true; thread.Start(new object[] { hostVisual, visualWrapper }); // Wait for the worker thread to spin up and create the VisualTarget. s_event.WaitOne(); return hostVisual; } private FrameworkElement CreateMediaElement(VisualWrapper visualWrapper) { BitmapImage bi = new BitmapImage(new Uri(--YOURIMAGEPATH--));//Image path goes here Image image = new Image(); image.Source = bi; image.Height = 150; image.Width = 150; //image.Margin = new Thickness(-150, -150, -150, -150); ImageBehavior.SetAnimatedSource(image, bi);//See http://wpfanimatedgif.codeplex.com/ BrushConverter conv = new BrushConverter(); //SolidColorBrush brush = conv.ConvertFromString("#6C8BBA") as SolidColorBrush; Border border = new Border(); border.Background = Brushes.Transparent; //border.BorderBrush = brush; //border.BorderThickness = new Thickness(3); //border.Margin = new Thickness(-85, -140, 0, 0); border.Child = image; return border; } private void MediaWorkerThread(object arg) { // Create the VisualTargetPresentationSource and then signal the // calling thread, so that it can continue without waiting for us. HostVisual hostVisual = (HostVisual)((object[])arg)[0]; VisualWrapper visualWrapper = (VisualWrapper)((object[])arg)[1]; VisualTargetPresentationSource visualTargetPS = new VisualTargetPresentationSource(hostVisual); s_event.Set(); // Create a MediaElement and use it as the root visual for the // VisualTarget. visualTargetPS.RootVisual = CreateMediaElement(visualWrapper); // Run a dispatcher for this worker thread. This is the central // processing loop for WPF. System.Windows.Threading.Dispatcher.Run(); } private static AutoResetEvent s_event = new AutoResetEvent(false); public bool ShowWaitDialog() { if (visualWrapper != null) { if (visualWrapper.Child == null) { visualWrapper.Child = CreateMediaElementOnWorkerThread(); } } return true; } public bool DisposeWaitDialog() { if (visualWrapper != null) { visualWrapper.Child = null; } return true; } #endregion } </code></pre> <p>The in code:</p> <pre><code>public MainWindow() { InitializeComponent(); VisualWrapper visualWrapper = (VisualWrapper)this.FindName("visualWrapper"); LoadingPanel loadingPanel = new LoadingPanel(visualWrapper); Dispatcher.Invoke((Action)(() =&gt; { loadingPanel.ShowWaitDialog(); }), DispatcherPriority.Send, null); Task.Factory.StartNew(() =&gt; { List&lt;string&gt; list = new List&lt;string&gt;(); for (int i = 0; i &lt; 14000; i++) { list.Add("Item number" + i); } Dispatcher.BeginInvoke((Action)(() =&gt; { Cb.ItemsSource = list; }), DispatcherPriority.Normal, null); }, TaskCreationOptions.LongRunning); } </code></pre> <p>Edit <code>VirtualizingStackPanel</code>:</p> <pre><code>An easy way to implement this is to create an ItemsPanelTemplate as a Resource and reference it in the ComboBox markup. &lt;Window.Resources&gt; &lt;ItemsPanelTemplate x:Key="VSP"&gt; &lt;VirtualizingStackPanel/&gt; &lt;/ItemsPanelTemplate&gt; &lt;/Window.Resources&gt; &lt;ComboBox Height="23" Margin="27,10,10,0" Name="ComboBox1" VerticalAlignment="Top" ItemsSource="{Binding}" ItemsPanel="{StaticResource VSP}" ScrollViewer.IsDeferredScrollingEnabled="True"&gt; &lt;/ComboBox&gt; Specifically, the ItemsPanel property of the ComboBox is set to that ItemsPanelTemplate Resource. If you prefer, you can include the VirtualizingStackPanel right in the ComboBox creation markup: &lt;ComboBox Height="23" Margin="27,10,10,0" Name="ComboBox1" VerticalAlignment="Top" ItemsSource="{Binding}" ScrollViewer.IsDeferredScrollingEnabled="True"&gt; &lt;ComboBox.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;VirtualizingStackPanel /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ComboBox.ItemsPanel&gt; &lt;/ComboBox&gt; </code></pre>
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    1. POWPF How to show Gif animation when GUI is freezy?
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    1. COSorry, can you tell what References i need to add for using ImageBehavior and VisualTargetPresentationSource?
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    2. CO[ImageBehavior](http://wpfanimatedgif.codeplex.com/) is an external dll. I missed the other class. See my updates
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    3. COThanks. Now it compile. But I getting "The calling thread cannot access this object because a different thread owns it" on row Cb.Items.Add("Item number" + i); And some fix: If i undestand correctly than you start fill comboitems in other process but in my variant it not raise GUI freez. GUI freez happens when WPF drawing comboitems on first combobox dropdown
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