support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/HT.cs

@@ -0,0 +1,38 @@
+namespace Standard
+{
+    using System;
+
+    internal enum HT
+    {
+        BORDER = 0x12,
+        BOTTOM = 15,
+        BOTTOMLEFT = 0x10,
+        BOTTOMRIGHT = 0x11,
+        CAPTION = 2,
+        CLIENT = 1,
+        CLOSE = 20,
+        ERROR = -2,
+        GROWBOX = 4,
+        HELP = 0x15,
+        HSCROLL = 6,
+        LEFT = 10,
+        MAXBUTTON = 9,
+        MENU = 5,
+        MINBUTTON = 8,
+        NOWHERE = 0,
+        OBJECT = 0x13,
+        REDUCE = 8,
+        RIGHT = 11,
+        SIZE = 4,
+        SIZEFIRST = 10,
+        SIZELAST = 0x11,
+        SYSMENU = 3,
+        TOP = 12,
+        TOPLEFT = 13,
+        TOPRIGHT = 14,
+        TRANSPARENT = -1,
+        VSCROLL = 7,
+        ZOOM = 9
+    }
+}
+