support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/IEnumObjects.cs

@@ -0,0 +1,15 @@
+namespace Standard
+{
+    using System;
+    using System.Runtime.InteropServices;
+
+    [ComImport, Guid("2c1c7e2e-2d0e-4059-831e-1e6f82335c2e"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal interface IEnumObjects
+    {
+        void Next(uint celt, [In] ref Guid riid, [Out, MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.IUnknown, SizeParamIndex=0)] object[] rgelt, out uint pceltFetched);
+        void Skip(uint celt);
+        void Reset();
+        Standard.IEnumObjects Clone();
+    }
+}
+