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copied!<p>If you enable CLR Exceptons to break when thrown (under Debug|Exceptions) you'll see this stack trace:</p> <pre><code>mscorlib.dll!System.ThrowHelper.ThrowArgumentOutOfRangeException(System.ExceptionArgument argument, System.ExceptionResource resource) + 0x10 bytes mscorlib.dll!System.ThrowHelper.ThrowArgumentOutOfRangeException() + 0x9 bytes mscorlib.dll!System.Collections.Generic.List<object>.this[int].get(int index) + 0xe bytes mscorlib.dll!System.Collections.ObjectModel.Collection<object>.System.Collections.IList.get_Item(int index) + 0x7 bytes System.Windows.dll!System.Windows.Controls.ItemCollection.GetItemImpl(int index) + 0x17 bytes System.Windows.dll!System.Windows.Controls.ItemCollection.GetItemImplSkipMethodPack(int index) + 0x2 bytes System.Windows.dll!System.Windows.PresentationFrameworkCollection<object>.this[int].get(int index) + 0x2 bytes System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.CleanupContainers(System.Windows.Controls.ItemsControl itemsControl) + 0xa3 bytes System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(System.Windows.Size constraint) + 0x56a bytes System.Windows.dll!System.Windows.FrameworkElement.MeasureOverride(System.IntPtr nativeTarget, float inWidth, float inHeight, out float outWidth, out float outHeight) + 0x45 bytes [External Code] </code></pre> <p>For some reason the virtualizing stack panel is trying to clean up the element at index -1 (you can see this value for index in the stack frame).</p> <p>The type of the ObservableCollection's contents makes no difference. You get the same error with strings ... and it happens with just two elements.</p> <p>To me it looks like a <a href="https://stackoverflow.com/questions/1659692/argumentoutofrangeexception-when-replacing-items-in-an-observablecollectiont">bug</a> in the VirtualizingStackPanel. You can work around it (if you don't need the virtualizing functionality) by setting the VirtualizationMode to Standard instead of Recycling on the ListBox:</p> <pre><code><ListBox VirtualizingStackPanel.VirtualizationMode="Standard" ... </ListBox> </code></pre>

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