[niepce] Remove the last Gtk::VBox references

[Hubert Figuière <hub src gnome org>]

commit 81fd3484cb98af7fc1cf326ffdb9624166103e8c
Author: Hubert Figuière <hub figuiere net>
Date:   Mon May 22 09:42:28 2017 -0400

    Remove the last Gtk::VBox references

 src/fwk/toolkit/widgets/dock-item.cpp |    2 +-
 src/fwk/toolkit/widgets/dock.cpp      |    1 +
 src/fwk/toolkit/widgets/dock.hpp      |    4 ++--
 3 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/fwk/toolkit/widgets/dock-item.cpp b/src/fwk/toolkit/widgets/dock-item.cpp
index dfc78ab..f748a13 100644
--- a/src/fwk/toolkit/widgets/dock-item.cpp
+++ b/src/fwk/toolkit/widgets/dock-item.cpp
@@ -96,7 +96,7 @@ DockItem::gobj()
     return _gdl_dock_item;
 }
 
-Gtk::VBox *
+Gtk::Box *
 DockItem::get_vbox()
 {
     return &_dock_item_box;
diff --git a/src/fwk/toolkit/widgets/dock.cpp b/src/fwk/toolkit/widgets/dock.cpp
index f081ced..a33e76d 100644
--- a/src/fwk/toolkit/widgets/dock.cpp
+++ b/src/fwk/toolkit/widgets/dock.cpp
@@ -24,6 +24,7 @@ namespace fwk {
 
 
 Dock::Dock()
+  : m_vbox(Gtk::ORIENTATION_VERTICAL)
 {
   set_policy(Gtk::POLICY_NEVER, Gtk::POLICY_ALWAYS);
   add(m_vbox);
diff --git a/src/fwk/toolkit/widgets/dock.hpp b/src/fwk/toolkit/widgets/dock.hpp
index 22634d5..d21075d 100644
--- a/src/fwk/toolkit/widgets/dock.hpp
+++ b/src/fwk/toolkit/widgets/dock.hpp
@@ -33,10 +33,10 @@ class Dock
 public:
     Dock();
 
-    Gtk::VBox & vbox()
+    Gtk::Box & vbox()
         { return m_vbox; }
 private:
-    Gtk::VBox m_vbox;
+    Gtk::Box m_vbox;
 };