stage automation peer class

Microsoft.Toolkit.Uwp.UI.Controls.Layout/ContentSizer/ContentSizerAutomationPeer.cs

@@ -0,0 +1,22 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Automation.Peers;
+using Microsoft.Toolkit.Uwp.UI.Controls;
+
+namespace Microsoft.Toolkit.Uwp.UI.Controls.ContentSizer
+{
+    public class ContentSizerAutomationPeer : FrameworkElementAutomationPeer
+    {
+        public ContentSizerAutomationPeer(SplitBase owner) : base(owner)
+        {
+
+        }
+
+        private ContentSizer OwningContentSizer
+        {
+            get
+            {
+                return Owner as ContentSizer;
+            }
+        }
+    }
+}