Наследование: ViewModelBase, IServerSettingsTemplateViewModel
 private void ServerSettingsView_DataContextChanged (object sender, System.Windows.DependencyPropertyChangedEventArgs e)
 {
   _viewModel = e.NewValue as ServerSettingsTemplateViewModel;
   if (_viewModel != null)
   {
     // Password is just a OneWayBinding. Therefore just set the initial value
     _passwordBox.Password = SecureStringUtility.ToUnsecureString (_viewModel.Password);
   }
 }