public CustomerDetailsViewModel()
        {
            if (IsInDesignMode)
             {
            m_currentCustomer = new Customer
               {
                  FirstName = "Frank",
                  LastName = "Spolsky",
                  Age = 12,
                  Address = "BamBam !"
               };
             }
             else
             {
            m_currentCustomer = new Customer();
             }

             CloseWindowCommandCommand = new CloseWindowCommand();
        }
 public CustomerDetailsViewModel(Customer a_currentCustomer)
     : this()
 {
     m_currentCustomer = a_currentCustomer;
 }