Additional fields Add, Update and Delete work (too well)

SelectableListView works when programmatically setting selection

WinAppCommon/Messages/EntryFieldValueChangedMessage.cs

@@ -0,0 +1,8 @@
+namespace Messages
+{
+    public class EntryFieldValueChangedMessage
+    {
+        public string FieldName { get; set; }
+        public string FieldValue { get; set; }
+    }
+}