<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</ListBoxItem> <ListBoxItem>Second</ListBoxItem> <ListBoxItem>Third</ListBoxItem> <ListBoxItem>Fourth</ListBoxItem> <ListBoxItem>Fifth</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>