demo: update demos

Samples~/Demo/Scripts/CopyItemOnStart.cs

@@ -0,0 +1,25 @@
+using UnityEngine;
+
+namespace Coffee.UIExtensions.Demo
+{
+    public class CopyItemOnStart : MonoBehaviour
+    {
+        public GameObject origin;
+        public int count;
+
+        private void Start()
+        {
+            if (!origin) return;
+            origin.SetActive(false);
+
+            var parent = origin.transform.parent;
+            for (var i = 0; i < count; i++)
+            {
+                var go = Instantiate(origin, parent, false);
+                go.name = string.Format("{0} {1}", origin.name, i + 1);
+                go.hideFlags = HideFlags.DontSave;
+                go.SetActive(true);
+            }
+        }
+    }
+}