Multiple levels of binding in WPF ItemsControl - wpf

Question

How can i bind multiple levels of data in same time like List of chapters and under each chapter list of pages.
The class structure and xaml i used is shown here
public class ContentsPage
{
public string cname{ get; set; }
public string label { get; set; }
}
public class Chapter
{
public string name { get; set; }
public string id { get; set; }
public List<ContentsPage> pages { get; set; }
}
public class Model
{
public List<Chapter> chapters { get; set; }
}
<ItemsControl x:Name="TopLevelListBox" ItemsSource="{Binding}" >
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander ExpandDirection="Down" Width="175">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=name}" Margin="0,0,5,0"/>
</StackPanel>
</Expander.Header>
<ListBox x:Name="SubListBox" ItemsSource="{Binding Path=enrichments}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=cname}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
For binding i used the code
Model data = new Model(); //load data
TopLevelListBox.DataContext = data.chapters;
Only my expander headers are filled with result. What i need to do fill the pages inside the expander ? Any ideas or samples link for doing the same

Answer 1

Your ItemsControl Item template should change a bit. Instead of setting the ListBox as Content of Expander, set it as Content Template.
<Expander ExpandDirection="Down"
Width="175" Content="{Binding}">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=name}"
Margin="0,0,5,0" />
</StackPanel>
</Expander.Header>
<Expander.ContentTemplate>
<DataTemplate>
<ListBox x:Name="SubListBox"
ItemsSource="{Binding Path=enrichments}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=cname}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</DataTemplate>
</Expander.ContentTemplate>
</Expander>
And make sure you have sub items to show in ListBox.