Caliburn.Micro support for PasswordBox?

Question

The Caliburn.Micro home page at http://caliburnmicro.com makes the below claim but I am unable to make CM work with a PasswordBox control using any variation I can think of

Answer 1

Here's a much more simplified example, including a binding convention so that PasswordBox binding in Caliburn.Micro Just Works™:

public static class PasswordBoxHelper
{
    public static readonly DependencyProperty BoundPasswordProperty =
        DependencyProperty.RegisterAttached("BoundPassword",
            typeof(string),
            typeof(PasswordBoxHelper),
            new FrameworkPropertyMetadata(string.Empty, OnBoundPasswordChanged));

    public static string GetBoundPassword(DependencyObject d)
    {
        var box = d as PasswordBox;
        if (box != null)
        {
            // this funny little dance here ensures that we've hooked the
            // PasswordChanged event once, and only once.
            box.PasswordChanged -= PasswordChanged;
            box.PasswordChanged += PasswordChanged;
        }

        return (string)d.GetValue(BoundPasswordProperty);
    }

    public static void SetBoundPassword(DependencyObject d, string value)
    {
        if (string.Equals(value, GetBoundPassword(d)))
            return; // and this is how we prevent infinite recursion

        d.SetValue(BoundPasswordProperty, value);
    }

    private static void OnBoundPasswordChanged(
        DependencyObject d,
        DependencyPropertyChangedEventArgs e)
    {
        var box = d as PasswordBox;

        if (box == null)
            return;

        box.Password = GetBoundPassword(d);
    }

    private static void PasswordChanged(object sender, RoutedEventArgs e)
    {
        PasswordBox password = sender as PasswordBox;

        SetBoundPassword(password, password.Password);

        // set cursor past the last character in the password box
        password.GetType().GetMethod("Select", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(password, new object[] { password.Password.Length, 0 }); 
    }

}

Then, in your bootstrapper:

public sealed class Bootstrapper : BootstrapperBase
{
    public Bootstrapper()
    {
        Initialize();

        ConventionManager.AddElementConvention(
            PasswordBoxHelper.BoundPasswordProperty,
            "Password",
            "PasswordChanged");
    }

    // other bootstrapper stuff here
}