support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/Win32Value.cs

@@ -0,0 +1,16 @@
+namespace Standard
+{
+    using System;
+
+    internal static class Win32Value
+    {
+        public const uint FALSE = 0;
+        public const uint INFOTIPSIZE = 0x400;
+        public const uint MAX_PATH = 260;
+        public const uint sizeof_BOOL = 4;
+        public const uint sizeof_CHAR = 1;
+        public const uint sizeof_WCHAR = 2;
+        public const uint TRUE = 1;
+    }
+}
+