Add project files.

Examples/Nodify.Shapes/Canvas/Decorators/ICanvasDecorator.cs

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+using System.Windows;
+
+namespace Nodify.Shapes.Canvas
+{
+    public interface ICanvasDecorator
+    {
+        Point Location { get; set; }
+    }
+}

Examples/Nodify.Shapes/Canvas/Decorators/ShapeToolbarViewModel.cs

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+using System.ComponentModel;
+using System.Windows;
+
+namespace Nodify.Shapes.Canvas
+{
+    public class ShapeToolbarViewModel : ObservableObject, ICanvasDecorator
+    {
+        private ShapeViewModel? _shape;
+        public ShapeViewModel? Shape
+        {
+            get => _shape;
+            set
+            {
+                var prevShape = _shape;
+                if (SetProperty(ref _shape, value))
+                {
+                    _hiddenShape = null;
+                    HookLocationEvents(prevShape, value);
+                }
+            }
+        }
+
+        private ShapeViewModel? _hiddenShape;
+
+        private Point _location;
+        public Point Location
+        {
+            get => _location;
+            set => SetProperty(ref _location, value);
+        }
+
+        private void HookLocationEvents(ShapeViewModel? prevShape, ShapeViewModel? newShape)
+        {
+            if (prevShape != null)
+                prevShape.PropertyChanged -= OnLocationChanged;
+
+            if (newShape != null)
+            {
+                newShape.PropertyChanged += OnLocationChanged;
+                Location = newShape.Location;
+            }
+        }
+
+        private void OnLocationChanged(object? sender, PropertyChangedEventArgs args)
+        {
+            if (args.PropertyName == nameof(ShapeViewModel.Location))
+                Location = ((ShapeViewModel)sender!).Location;
+        }
+
+        public void Hide()
+        {
+            _hiddenShape = _shape;
+            _shape = null;
+
+            OnPropertyChanged(nameof(Shape));
+        }
+
+        public void Show()
+        {
+            if (_hiddenShape != null)
+            {
+                _shape = _hiddenShape;
+                _hiddenShape = null;
+
+                OnPropertyChanged(nameof(Shape));
+            }
+        }
+    }
+}

Examples/Nodify.Shapes/Canvas/Decorators/UserCursorViewModel.cs

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+using System.Windows;
+using System.Windows.Media;
+
+namespace Nodify.Shapes.Canvas
+{
+    public class UserCursorViewModel : ObservableObject, ICanvasDecorator
+    {
+        private Point _location;
+        public Point Location
+        {
+            get => _location;
+            set => SetProperty(ref _location, value);
+        }
+
+        public string? Name { get; set; }
+
+        public Color Color { get; set; }
+    }
+}