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I am trying to do a basic use of CollectionViewSource and I must be missing something because it is just not working. Here is my XAML: <Window.Resources> <CollectionViewSource Source="{Binding loc:MainVM.Instance.MapItems}" x:Key="MapCV"> <CollectionViewSource.GroupDescriptions> <PropertyGroupDescription PropertyName="SourceProject" /> </CollectionViewSource.GroupDescriptions> </CollectionViewSource> </Window.Resources> <ListBox ItemsSource="{StaticResource MapCV}" HorizontalContentAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled"> <ListBox.ItemTemplate> <DataTemplate> <Grid HorizontalAlignment="Stretch"> <Grid.ColumnDefinitions> <ColumnDefinition Width="2*"/> <ColumnDefinition Width="2*"/> <ColumnDefinition Width="50"/> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Text="{Binding SourceType, Converter={StaticResource WorkItemTypeToStringConverter}}"/> <ComboBox Grid.Column="1" SelectedItem="{Binding DestType}" ItemsSource="{Binding WorkItemTypesForCurrentDestProject, Source={x:Static loc:MainMediator.Instance}, diagnostics:PresentationTraceSources.TraceLevel=High}" DisplayMemberPath="Name" /> <Button Grid.Column="2" Content="{Binding PercentMapped}"/> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> This compiles fine, but when I run the app I get this error: Cannot convert the value in attribute 'ItemsSource' to object of type 'System.Collections.IEnumerable'. 'System.Windows.Data.CollectionViewSource' is not a valid value for property 'ItemsSource'. Error at o

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