Validation fired but Red Border does not appear with User Control in Silverlight 4

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user-controls

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Hi,

I have created custom User Control which contain TextBox and PasswordBox. I bind TextBox to UserName and PassowrdBox also. The UserName is defined in my LoginViewModel class with [Required] attribute. Now my cursor is leaving from TextBox without entering any value then UserName property fire property changeed notifcation (INotifyPropertyChanged), but dose not mark my Textbox (which is inside the User Control) with Red border.

Following is code of my User Control.

RestrictedBox.xaml

<Grid x:Name="LayoutRoot" removed="Transparent" Margin="0" >
        <TextBox x:Name="txtTextBox" HorizontalAlignment="Stretch" Height="25" />
        <PasswordBox x:Name="txtPasswordBox" HorizontalAlignment="Stretch" Height="25" />
</Grid>

RestrictedBox.xaml.cs

public partial class RestrictedBox : UserControl
    {
        #region Properties
        public string Value
        {
            get { return (string)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }
        public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(RestrictedBox), new PropertyMetadata("", ValueChanged));
        private static void ValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
        }
        public bool Updateable
        {
            get { return (bool)GetValue(UpdateableProperty); }
            set { SetValue(UpdateableProperty, value); }
        }
        public static readonly DependencyProperty UpdateableProperty = DependencyProperty.Register("Updateable", typeof(bool), typeof(RestrictedBox), new PropertyMetadata(UpdateableChanged));
        private static void UpdateableChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
        }
        public bool Redactable
        {
            get { return (bool)GetValue(RedactableProperty); }
            set { SetValue(RedactableProperty, value); }
        }
        public static readonly DependencyProperty RedactableProperty = DependencyProperty.Register("Redactable", typeof(bool), typeof(RestrictedBox), new PropertyMetadata(RedactableChanged));
        private static void RedactableChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
        }
        #endregion
        #region Constructors
        public RestrictedBox()
        {
            InitializeComponent();
            txtTextBox.SetBinding(TextBox.TextProperty, new Binding { Source = this, Path = new PropertyPath("Value"), Mode = BindingMode.TwoWay});
            txtTextBox.SetBinding(TextBox.VisibilityProperty, new Binding("Redactable") { Source = this, Converter = new BoolToVisibilityConverterReverse() });
            txtPasswordBox.SetBinding(PasswordBox.PasswordProperty, new Binding { Source = this, Path = new PropertyPath("Value"), Mode = BindingMode.TwoWay });
            txtPasswordBox.SetBinding(TextBox.VisibilityProperty, new Binding("Redactable") { Source = this, Converter = new BoolToVisibilityConverter() });
       }
        #endregion
    }

Following is the code where i used my Custom User Control

LoginView.xaml

<Control:RestrictedBox x:Name="UserName" VerticalAlignment="Top" TabIndex="2" Grid.Row="1"  Grid.Column="1" HorizontalAlignment="Stretch" Height="40" Value="{Binding Path=LoginModelValue.UserName, Mode=TwoWay, ValidatesOnNotifyDataErrors=True, ValidatesOnExceptions=True,
 ValidatesOnDataErrors=True, NotifyOnValidationError=True}" Validatevalue:UpdateSourceTriggerHelper.UpdateSourceTrigger="True" Redactable="True" Updateable="True"  />

LoginView.xaml.cs

[Export(typeof(LoginView))]
    [PartCreationPolicy(CreationPolicy.NonShared)]
    public partial class LoginView : UserControl, IPageTitle
    {
        #region Constuctors
        public LoginView()
        {
            InitializeComponent();
        }
        [Import]
        public LoginViewModel ViewModel
        {
            get {return this.DataContext as LoginViewModel;}            
            set { DataContext = value; }
        }
        #endregion
    }

LoginViewModel.cs

[Export]
    [PartCreationPolicy(CreationPolicy.NonShared)]
    public class LoginViewModel : INotifyPropertyChanged, IRegionMemberLifetime
    {
        private LoginModel _LoginModelValue;
        public LoginModel LoginModelValue
        {
            get { return _LoginModelValue; }
            set
            {
                _LoginModelValue = value;
                OnPropertyChanged("LoginModelValue");
            }
        }
        #region INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged = delegate { };
        private void OnPropertyChanged(string propertyName)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
        void LoginModelValue_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (LoginModelValue.IsValidObject())
            {
                LoginCommand.RaiseCanExecuteChanged();
                IsEnabled = LoginModelValue.IsValidObject();
                SetIncorrectLogin(!IsEnabled);
            }
        }
        #endregion
    }

Can anybody has idea why i am not getting Red Border surrounded with my TextBox which is inside my Custom User Control?

Any help, suggestions and comments would be highly appreciated!

Thanks,
Imdadhusen