MVVM and password

I'm using MVVM and the model has password field. From what I've found on web, when handling this password you must implement custom class for binding and use PasswordBox. I think this is overhead. Could you point me to a better w开发者_如何学运维ay to using the add/edit usercontrols connected to a viewmodel with password?

Thank you

---

Easy way but not MVVM:

Xaml

<PasswordBox PasswordChanged="PasswordBox_PasswordChanged"

Xaml.cs

private void PasswordBox_PasswordChanged(object sender, RoutedEventArgs e)
{
    if (viewModel != null && sender is PasswordBox)
        viewModel.DatabasePassword = ((PasswordBox) sender).Password;
}

private void Load()
{
    //Fills viewModel.DatabasePassword
    viewModel.ReadData();

    PasswordBox.Password = viewModel.DatabasePassword;
}