Cannot use MVVM type to develop when I use HC control - hc:PasswordBox  #422

    private static void OnPasswordPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        PasswordBox passwordBox = sender as PasswordBox;

        string password = (string)e.NewValue;

        if (passwordBox != null && passwordBox.Password != password)
        {
            passwordBox.Password = password;
        }
    }

    public static string GetPassword(DependencyObject dp)
    {
        return (string)dp.GetValue(PasswordProperty);
    }

    public static void SetPassword(DependencyObject dp, string value)
    {
        dp.SetValue(PasswordProperty, value);
    }
}

public class PasswordBoxBehavior : Behavior<PasswordBox>
{
    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.PasswordChanged += OnPasswordChanged;
    }

    private static void OnPasswordChanged(object sender, RoutedEventArgs e)
    {
        PasswordBox passwordBox = sender as PasswordBox;

        string password = PasswordBoxHelper.GetPassword(passwordBox);

        if (passwordBox != null && passwordBox.Password != password)
        {
            PasswordBoxHelper.SetPassword(passwordBox, passwordBox.Password);
        }
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();

        AssociatedObject.PasswordChanged -= OnPasswordChanged;
    }
}`