[hyena] Gui: add IntPtr ctor to MessageBar

[AndrÃs Aragoneses <aaragoneses src gnome org>]

commit 6883798c75fa40e72aab0966fe4ba530ca2f4905
Author: AndrÃs G. Aragoneses <knocte gmail com>
Date:   Fri Oct 21 19:38:49 2011 +0100

    Gui: add IntPtr ctor to MessageBar
    
    Needed to fix bgo#634784 because this class
    is the base class of ConnectedMessageBar.

 Hyena.Gui/Hyena.Widgets/MessageBar.cs |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/Hyena.Gui/Hyena.Widgets/MessageBar.cs b/Hyena.Gui/Hyena.Widgets/MessageBar.cs
index 9582664..b83620c 100644
--- a/Hyena.Gui/Hyena.Widgets/MessageBar.cs
+++ b/Hyena.Gui/Hyena.Widgets/MessageBar.cs
@@ -104,6 +104,10 @@ namespace Hyena.Widgets
             BorderWidth = 3;
         }
 
+        protected MessageBar (IntPtr raw) : base (raw)
+        {
+        }
+
         protected override void OnShown ()
         {
             base.OnShown ();