未设置自定义控件的自定义属性 - xamarin表单

我正在尝试使用EntryType属性创建自定义条目控件，然后我在自定义渲染器中使用它来设置特定于平台的值 . 但是从Xaml使用时，从不设置EntryType . 这是我的代码：

public class ExtendedEntry : Xamarin.Forms.Entry
{

    public static readonly BindableProperty EntryTypeProperty = BindableProperty.Create(
        propertyName: "EntryType",
        returnType: typeof(int),
        declaringType: typeof(EntryTextType),
        defaultValue: 1
        );

    public EntryTextType EntryType
    {
        get
        {
            return (EntryTextType)GetValue(EntryTypeProperty);
        }
        set
        {
            SetValue(EntryTypeProperty, value);

        }
    }

    protected override void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        base.OnPropertyChanged(propertyName);

        if (propertyName == EntryTypeProperty.PropertyName)
        {

        }
    }
}

public enum EntryTextType
{
    Any,
    Numeric,
    Url,
    Email
}

public class ExtendedEntryRenderer : EntryRenderer
{
    public ExtendedEntryRenderer(Android.Content.Context context) : base(context)
    {

    }

    protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
    {
        base.OnElementChanged(e);

        if (Control != null)
        {
            var element = (ExtendedEntry)Element;
            Control.Hint = element.Placeholder;
            switch(element.EntryType)
            {
                case EntryTextType.Numeric:
                    Control.SetRawInputType(Android.Text.InputTypes.ClassNumber);
                    break;
                default:
                    break;
            }
        }
    }

    protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        var p = e.PropertyName;
        base.OnElementPropertyChanged(sender, e);
    }

}

然后在XAML中，我使用控件：

<controls:ExtendedEntry Placeholder="Password" IsPassword="True" Text="{Binding Secret}" EntryType="Any"/>

问题是 EntryType never gets set to EntryTextType.Any ，并始终使用EntryTextType.Numeric的默认值 . 我在这里错过了什么？谢谢 .