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Why won't this support horizontal scrolling? <ScrollViewer> <ItemsControl ItemsSource="{Binding Territories}" HorizontalAlignment="Left"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel CanHorizontallyScroll="True" ScrollViewer.HorizontalScrollBarVisibility="Visible" ScrollViewer.VerticalScrollBarVisibility="Auto" > </VirtualizingStackPanel> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <Grid > <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="75" /> <ColumnDefinition Width="75" /> <ColumnDefinition Width="150" /> <ColumnDefinition Width="150" /> <ColumnDefinition Width="65" /> <ColumnDefinition Width="60" /> <ColumnDefinition Width="75" /> <ColumnDefinition Width="75" /> </Grid.ColumnDefinitions> <TextBox Grid.Row="0" Grid.Column="0" Text="{Binding Quantity, StringFormat=N0, ValidatesOnDataErrors=True}" /> <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding ProductionNumber, ValidatesOnDataErrors=True}" /> <ComboBox Grid.Row="0" Grid.Column="2" SelectedValuePath="PrimaryKey" SelectedValue="{Binding RepKey}" ItemsSource="{Binding RepCanidates}" TextSearch.TextPath="FullName" Margin="4"> <ComboBox.

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