support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/WS.cs

@@ -0,0 +1,37 @@
+namespace Standard
+{
+    using System;
+
+    [Flags]
+    internal enum WS : uint
+    {
+        BORDER = 0x800000,
+        CAPTION = 0xc00000,
+        CHILD = 0x40000000,
+        CHILDWINDOW = 0x40000000,
+        CLIPCHILDREN = 0x2000000,
+        CLIPSIBLINGS = 0x4000000,
+        DISABLED = 0x8000000,
+        DLGFRAME = 0x400000,
+        GROUP = 0x20000,
+        HSCROLL = 0x100000,
+        ICONIC = 0x20000000,
+        MAXIMIZE = 0x1000000,
+        MAXIMIZEBOX = 0x10000,
+        MINIMIZE = 0x20000000,
+        MINIMIZEBOX = 0x20000,
+        OVERLAPPED = 0,
+        OVERLAPPEDWINDOW = 0xcf0000,
+        POPUP = 0x80000000,
+        POPUPWINDOW = 0x80880000,
+        SIZEBOX = 0x40000,
+        SYSMENU = 0x80000,
+        TABSTOP = 0x10000,
+        THICKFRAME = 0x40000,
+        TILED = 0,
+        TILEDWINDOW = 0xcf0000,
+        VISIBLE = 0x10000000,
+        VSCROLL = 0x200000
+    }
+}
+