support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/WVR.cs

@@ -0,0 +1,17 @@
+namespace Standard
+{
+    using System;
+
+    internal enum WVR
+    {
+        ALIGNBOTTOM = 0x40,
+        ALIGNLEFT = 0x20,
+        ALIGNRIGHT = 0x80,
+        ALIGNTOP = 0x10,
+        HREDRAW = 0x100,
+        REDRAW = 0x300,
+        VALIDRECTS = 0x400,
+        VREDRAW = 0x200
+    }
+}
+