Binding Treeview using WCF Services

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Silverlight4

Hi,

I have 2 tables customer and user in customer cust_no is unique for that Customer i can add any number of users for that particular Customer No So, Now i have to show this in a TreeView like Customer No should be the Parent Node and the User No should be the Child Node (Like if we have 10 Customers and each Customer have more than 1 User if we click on Cust No we have to get the User No as Child Nodes)

I have tried a bit i got the Cust No but not able to get the User No as the Child Nodes

void FillTreeView()
        {
            client.CustNoCompleted += new System.EventHandler<CustNoCompletedEventArgs>(client_CustNoCompleted);
            client.CustNoAsync();

        }

        void client_CustNoCompleted(object sender, CustNoCompletedEventArgs e)
        {
            TreeViewItem tvitem = new TreeViewItem();
            tvitem.Header = "Customer";

            List<Cust> cust = e.Result;
            var list = from o in cust
                       select o.Customer_No;

            custtreeview.ItemsSource = list;

            //treeview.ItemsSource = list;

        }