密码框上的 Catel 验证不起作用

无法对PasswordBox进行验证。当我将鼠标悬停在PasswordBox上时，未以红色边框突出显示，也没有消息。对于TextBox它运作良好。如何解决这个问题？

<TextBox Height="23" Margin="10,40,10,0" TextWrapping="Wrap" VerticalAlignment="Top" HorizontalAlignment="Center"
         Text="{Binding Login, ValidatesOnDataErrors=True, NotifyOnValidationError=True}"   Width="220"/>
<PasswordBox  Margin="10,100,10,0" Height="23" VerticalAlignment="Top" HorizontalAlignment="Center" Width="220" >
    <i:Interaction.Behaviors>
        <catel:UpdateBindingOnPasswordChanged Password="{Binding Password,  Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=True}" />
    </i:Interaction.Behaviors>
</PasswordBox>

C# 代码

  protected override void ValidateFields(List<IFieldValidationResult> validationResults)
    {
        if (string.IsNullOrEmpty(Login))
        {
            validationResults.Add(FieldValidationResult.CreateError(LoginProperty, "Login cannot be empty"));
        }
        if (string.IsNullOrEmpty(Password))
        {
            validationResults.Add(FieldValidationResult.CreateError(PasswordProperty, "Password cannot be empty"));
        }
    }