LongBindingPath.xaml

<!-- ==================================================
      LongBindingPath.xaml (c) 2006 by Charles Petzold
     ================================================== -->
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:s="clr-namespace:System;assembly=mscorlib"
      FontSize="12pt"
      Name="page">
    <StackPanel>
        <TextBlock HorizontalAlignment="Center">
            First element in StackPanel
        </TextBlock>

        <ListBox HorizontalAlignment="Center"
                 Margin="24">
            <ListBoxItem>First ListBox Item</ListBoxItem>
            <ListBoxItem>Second ListBox Item</ListBoxItem>
            <ListBoxItem>Third ListBoxItem</ListBoxItem>
            <ListBoxItem>Fourth ListBox Item</ListBoxItem>
            <ListBoxItem>Fifth ListBoxItem</ListBoxItem>
        </ListBox>

        <TextBlock HorizontalAlignment="Center">
            <Label Content="Number of characters in third ListBox item = " />
            <Label Content="{Binding ElementName=page, 
                        Path=Content.Children[1].Items[2].Content.Length}" />
            <LineBreak />
            <Label Content="Number of characters in selected item = " />
            <Label Content="{Binding ElementName=page,
                        Path=Content.Children[1].SelectedItem.Content.Length}" />
        </TextBlock>
    </StackPanel>
</Page>