Helper/PasswordBoxHelper.cs

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using System.Windows;
using System.Windows.Controls;

namespace XStart2._0.Helper {
    public static class PasswordBoxHelper {

        public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordBoxHelper),
                                                                                                          new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged));
        public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordBoxHelper), new PropertyMetadata(false, OnAttachPropertyChanged));

        private static readonly DependencyProperty IsUpdatingProperty = DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(PasswordBoxHelper));


        public static void SetAttach(DependencyObject dp, bool value) {
            dp.SetValue(AttachProperty, value);
        }

        public static bool GetAttach(DependencyObject dp) {
            return (bool)dp.GetValue(AttachProperty);
        }

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

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

        private static bool GetIsUpdating(DependencyObject dp) {
            return (bool)dp.GetValue(IsUpdatingProperty);
        }

        private static void SetIsUpdating(DependencyObject dp, bool value) {
            dp.SetValue(IsUpdatingProperty, value);
        }

        private static void OnPasswordPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) {
            PasswordBox passwordBox = sender as PasswordBox;
            passwordBox.PasswordChanged -= PasswordChanged;
            if (!(bool)GetIsUpdating(passwordBox)) {
                passwordBox.Password = (string)e.NewValue;
            }
            passwordBox.PasswordChanged += PasswordChanged;
        }

        private static void OnAttachPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) {
            PasswordBox passwordBox = sender as PasswordBox;
            if (passwordBox == null) {
                return;
            }
            if ((bool)e.OldValue) {
                passwordBox.PasswordChanged -= PasswordChanged;
            }
            if ((bool)e.NewValue) {
                passwordBox.PasswordChanged += PasswordChanged;
            }
        }

        private static void PasswordChanged(object sender, RoutedEventArgs e) {