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    <p>Interesting.</p> <p>look at this blog post and see if it is helping you. <a href="http://blog.functionalfun.net/2008/06/wpf-passwordbox-and-data-binding.html" rel="noreferrer">http://blog.functionalfun.net/2008/06/wpf-passwordbox-and-data-binding.html</a></p> <p>Apparently the link is dead now so here is the original solution (found <a href="http://www.wpftutorial.net/PasswordBox.html" rel="noreferrer">here</a>):</p> <p>You can use attached properties to create a helper like this:</p> <pre> public static class PasswordHelper { public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordHelper), new FrameworkPropertyMetadata(string.Empty, OnPasswordPropertyChanged)); public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordHelper), new PropertyMetadata(false, Attach)); private static readonly DependencyProperty IsUpdatingProperty = DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(PasswordHelper)); 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 Attach(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) { PasswordBox passwordBox = sender as PasswordBox; SetIsUpdating(passwordBox, true); SetPassword(passwordBox, passwordBox.Password); SetIsUpdating(passwordBox, false); } } </pre> <p>Use it:</p> <pre><code>&lt;PasswordBox w:PasswordHelper.Attach="True" w:PasswordHelper.Password="{Binding Text, ElementName=plain, Mode=TwoWay}" Width="100"/&gt; </code></pre>
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    1. COI know this is a really old answer and works, but did anyone notice how wacky the code is? Maybe I should post a less complicated version of it?
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