support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Interactivity/NameResolvedEventArgs.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace HandyControl.Interactivity
+{
+    internal sealed class NameResolvedEventArgs : EventArgs
+    {
+        public NameResolvedEventArgs(object oldObject, object newObject)
+        {
+            OldObject = oldObject;
+            NewObject = newObject;
+        }
+
+        public object NewObject { get; }
+
+        public object OldObject { get; }
+    }
+}