Datalinking against properties in two ViewModels?

Datalinking against properties in two ViewModels?

I can not seem to get it right with datalinking and create a different type of datalinking. Any idea to get it to work? 
  
    
   
  1. # Csharp
    2. 
   
  2.     [Serializable]
    3. 
   
  3.     public class BokingViewModel
    4. 
   
  4.     {
    5. 
   
  5.         public AccountViewModel AccountViewModel { get; set; }
    6. 
   
  6.         public TravelViewModel TravelViewModel { get; set; }
    7. 
   
  7.         public int Ordernr{ get; set; }
    8. 
   
  8.     }
    9. 
   
  9. # Javascript
    10. 
   
  10.       var customer = {  
    11. 
   
  11.       // Kunduppgifter
    12. 
   
  12.       $("#form1").each(function (i) {
    13. 
   
  13.            $("fieldset.contact input", this)
    14. 
   
  14.                         .link(customer, { 
    15. 
   
  15.                                     "AccountViewModel.Firstname", "Firstname"
    16. 
   
  16.                          });
    17. 
   
  17.       });
    18. 
   
  18.       $(customer).data("Firstname", "Test");
    19.