[hyena] Add protected IntPtr ctors; ergh!

[Gabriel Burt <gburt src gnome org>]

commit eff98561f53914e09cd6efd8352f907388405a4a
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Sat May 22 12:05:22 2010 -0700

    Add protected IntPtr ctors; ergh!

 src/Hyena.Gui/Hyena.Widgets/MenuButton.cs |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/Hyena.Gui/Hyena.Widgets/MenuButton.cs b/src/Hyena.Gui/Hyena.Widgets/MenuButton.cs
index 2dc9e1a..6df820c 100644
--- a/src/Hyena.Gui/Hyena.Widgets/MenuButton.cs
+++ b/src/Hyena.Gui/Hyena.Widgets/MenuButton.cs
@@ -41,6 +41,8 @@ namespace Hyena.Widgets
         private Menu menu;
         private Widget size_widget;
 
+        protected MenuButton (IntPtr ptr) : base (ptr) {}
+
         public MenuButton ()
         {
         }