void OnCustomerAddedToRepository(object sender, CustomerAddedEventArgs e)
 {
     var viewModel = new CustomerViewModel(e.NewCustomer, _customerRepository);
     this.AllCustomers.Add(viewModel);
 }
 void CreateNewCustomer()
 {
     FECustomer newCustomer = new FECustomer();
     CustomerViewModel workspace = new CustomerViewModel(newCustomer, _customerRepository);
     this.Workspaces.Add(workspace);
     this.SetActiveWorkspace(workspace);
 }