The key is to modify
ListBox ItemTemplate[
^] like this:
<ListBox x:Name="CorrWord" Grid.Row="1" Grid.Column="4" Grid.RowSpan="3" BorderBrush="Black" BorderThickness="4" FontFamily="Agency FB" HorizontalContentAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<DockPanel Background="LightCoral">
<TextBlock Text="{Binding}"/>
<TextBlock Text="{Binding Path=Length}" HorizontalAlignment="Right"/>
</DockPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
My code like this:
CorrWord.ItemsSource = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.".Split();