Add project files.

Examples/Nodify.Shapes/Controls/ResizableContainer.cs

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+using System.Windows;
+
+namespace Nodify.Shapes.Controls
+{
+    internal class ResizableContainer : ResizablePanel
+    {
+        public static readonly DependencyProperty GridCellSizeProperty = NodifyEditor.GridCellSizeProperty.AddOwner(typeof(ResizableContainer));
+
+        public uint GridCellSize
+        {
+            get => (uint)GetValue(GridCellSizeProperty);
+            set => SetValue(GridCellSizeProperty, value);
+        }
+
+        protected override void OnMove(double x, double y)
+        {
+            // we can't use the default behavior because we are not inside a Canvas
+            if (TemplatedParent is ItemContainer item)
+            {
+                item.Location = new Point(item.Location.X + x, item.Location.Y + y);
+            }
+        }
+
+        protected override void OnProcessDelta(ref double dx, ref double dy)
+        {
+            // snap to grid
+            dx = (int)dx / GridCellSize * GridCellSize;
+            dy = (int)dy / GridCellSize * GridCellSize;
+        }
+    }
+}