UI Automation: How to make a property of a custom UserControl visible for Inspect?

Hi!

I'm doing some research for automated testing at the moment and I ran into a problem when using the UI Automation and the Automation Peers.

In a demo application I create a custom UserControl that basically only holds a Ellipse. I've then created a DependencyProperty called 'EllipseFill' that allows to set the Fill of said Ellipse. From a funtional point of view this works fine already.

I then tried to make the custom UserControl visible for UI Automation. I therefore implemented a custom AutomationPeer-claas. Now my custom UserControl is visible in Inspect, but unfortunately I fail to make the 'EllipseFill' property visible. I was not able to find a corresponding tutorial on the web - could please someone here help me out?

Here is my custom UserControl's code:

public partial class AUIEllipseUserControl : UserControl
    {
        protected override AutomationPeer OnCreateAutomationPeer()
        {
            return new AUIEllipseUserControlAutomationPeer(this);
        }

        public AUIEllipseUserControl()
        {
            InitializeComponent();          
        }

        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            AUIEllipseUserControl aui = d as AUIEllipseUserControl;
            if (aui != null && (e.OldValue != e.NewValue))
            {
                aui.InnerElipse.Fill = e.NewValue as SolidColorBrush;                
            }
        }
        public static readonly DependencyProperty EllipseFillProperty = DependencyProperty.Register("EllipseFill", typeof(SolidColorBrush), typeof(AUIEllipseUserControl), new FrameworkPropertyMetadata(OnPropertyChanged));

        public SolidColorBrush EllipseFill
        {
            get { return this.GetValue(EllipseFillProperty) as SolidColorBrush; }
            set { this.SetValue(EllipseFillProperty, value); }
        }

        private class AUIEllipseUserControlAutomationPeer : FrameworkElementAutomationPeer
        {

            public AUIEllipseUserControlAutomationPeer(FrameworkElement owner)
                : base(owner)
            {
                if (!(owner is AUIEllipseUserControl))
                    throw new ArgumentOutOfRangeException();
            }

            protected override string GetClassNameCore()
            {
                return "AUIEllipseUserControl";
            }

            protected override AutomationControlType GetAutomationControlTypeCore()
            {
                return AutomationControlType.Custom;
            }

            protected override bool IsContentElementCore()
            {
                return true;
            }

            protected override bool IsControlElementCore()
            {
                return false;
            }
        }
    }

Any ideas what I have to do to make the 'EllipseFill' property visible?

Regards

Ralf