Exception: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: System.ApplicationException: Element is already loaded
  at Noesis.UIElement.UpdateLayout () [0x00015] in D:\Dev\iQmetrix\XQ.Shelf\Un
Noesis.Error.Check () (at Assets/Plugins/NoesisGUI/Scripts/Core/NoesisError.cs:21)
Noesis.UIRenderer.Noesis_UpdateRenderer (Int32 rendererId, Double timeInSeconds) (at Assets/Plugins/NoesisGUI/Scripts/Core/NoesisUIRendererImports.cs:145)
Noesis.UIRenderer.Update (Double timeInSeconds, AntialiasingMode aaMode, TessellationMode tessMode, TessellationQuality tessQuality, RendererFlags flags, Boolean enableMouse, Boolean enableTouch, Boolean enablePostProcess, Boolean flipVertically) (at Assets/Plugins/NoesisGUI/Scripts/Core/NoesisUIRenderer.cs:129)
NoesisGUIPanel.LateUpdate () (at Assets/Plugins/NoesisGUI/Scripts/NoesisGUIPanel.cs:203)

    public class NavigationTracker : DependencyObject
    {
        private static readonly IDictionary<NavigationAnchor, NavigationPoints> _navigationLookup =
            new Dictionary<NavigationAnchor, NavigationPoints>();
 
        private static void OnNavigationViewChanged(DependencyObject dependencyObject,
            DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            var scrollViewer = dependencyObject as ScrollViewer;
 
            if (scrollViewer == null)
            {
                throw new Exception("NavigationTracker can only be applied on ScrollViewers.");
            }
 
            //Only initialize once..
            var initialized = false;
            scrollViewer.SizeChanged += (sender, args) =>
            {
                if (!initialized)
                {
                    Initialize(scrollViewer);
                    initialized = true;
                }
            };
        }
 
        private static void Initialize(ScrollViewer scrollViewer)
        {
            var panel = scrollViewer.Content as Panel;
 
            if (panel == null)
            {
                throw new Exception("Can only track panels in the scrollviewer");
            }
 
            foreach (var child in panel.Children.Cast<FrameworkElement>())
            {
                var matrix = child.TransformToAncestor(scrollViewer);
                var position = new Point(matrix[3].X, matrix[3].Y);
                Debug.Log(position);
            }
        }
 
        // NOTE: Value type needs to match DependencyProperty type!!! (it was string in your code)
        public static void SetNavigationView(UIElement element, NavigationView value)
        {
            element.SetValue(NavigationViewProperty, value);
        }
 
        public static NavigationView GetNavigationView(UIElement element)
        {
            return (NavigationView)element.GetValue(NavigationViewProperty);
        }
 
        public static DependencyProperty NavigationViewProperty =
            DependencyProperty.RegisterAttached("NavigationView", typeof (NavigationView), typeof (NavigationTracker), new PropertyMetadata(null, OnNavigationViewChanged));
    }