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I've got a ListBox control and I'm presenting a fixed number of ListBoxItem objects in a grid layout. So I've set my ItemsPanelTemplate to be a Grid. I'm accessing the Grid from code behind to configure the RowDefinitions and ColumnDefinitions. So far it's all working as I expect. I've got some custom IValueConverter implementations for returning the Grid.Row and Grid.Column that each ListBoxItem should appear in. However I get weird binding errors sometimes, and I can't figure out exactly why they're happening, or even if they're in my code. Here's the error I get: System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=HorizontalContentAlignment; DataItem=null; target element is 'ListBoxItem' (Name=''); target property is 'HorizontalContentAlignment' (type 'HorizontalAlignment') Can anybody explain what's going on? Oh, and, here's my XAML: <UserControl.Resources>  <v:GridRowConverter x:Key="GridRowConverter" /> <v:GridColumnConverter x:Key="GridColumnConverter" /> <v:DevicePositionConverter x:Key="DevicePositionConverter" /> <v:DeviceBackgroundConverter x:Key="DeviceBackgroundConverter" /> <Style x:Key="DeviceContainerStyle" TargetType="{x:Type ListBoxItem}"> <Setter Property="FocusVisualStyle" Value="{x:Null}" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Grid.Row" Value="{Binding Path=DeviceId, Converter={StaticResource GridRowConverter}}" /> <Setter Property="Grid.Column" Value="{Binding Path=DeviceId, Converter={StaticResource GridColumnConverter}}" /> <Setter Property="Template"> <Setter.Value>

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