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 from that example. Don't see how this would work anyway since the names are not the same case. Does anyone have a CM example that does allow me to get the value of the PasswordBox? Is there a particular version of CM required? I'm running version 1.5.2 of CM. Ideally w/o using Attached Properties but if can work with CM and the only way then fine. Please no lectures on security issues as that is not an issue in my case.

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Apply methods between your view and view model automatically with parameters and guard methods

<StackPanel>
    <TextBox x:Name="Username" />
    <PasswordBox x:Name="Password" />
    <Button x:Name="Login" Content="Log in" />
</StackPanel>

public bool CanLogin(string username, string password)
{
    return !String.IsNullOrEmpty(username) && !String.IsNullOrEmpty(password);
}

public string Login(string username, string password)
{
    ...
}

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<PasswordBox>(
            PasswordBoxHelper.BoundPasswordProperty,
            "Password",
            "PasswordChanged");
    }

    // other bootstrapper stuff here
}