Silverlight – How to bind TreeViewItem.isexpanded data to node data objects

public class MyNode 
{
 public string Name {get; set;}
 public bool IsExpanded {get; set;}
 public List Nodes {get; set;}
}

I have a class like hierarchical data

< p>

public class MyNode 
{
 public string Name {get; set;}
 public bool IsExpanded {get; set;}
 public List< MyNode> Nodes {get; set;}
}

I can define a HierarchicalDataTemplate to bind the MyNode class to the TreeView.

< sdk:TreeView ItemsSource="{Binding RootNodes}">
 
 
 
 
 
< /pre> 
The question is how to bind the IsExpanded property of TreeViewItem to the corresponding MyNode.IsExpanded property, so I can keep this information.
 
Thank you in advance, 
Lex
 p>
I'm not sure if this applies to Silverlight, but in WPF, you can bind to IsExpanded using styles: 
 
< /p>