[gnome-boxes] PropertiesToolbar: Make the back button public

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 4704021f920720ab77016db182eb41dca6617e73
Author: Timm Bäder <mail baedert org>
Date:   Thu Aug 21 17:06:43 2014 +0200

    PropertiesToolbar: Make the back button public
    
    To do that, rename it from 'back' to 'back_button' to make the name more
    desriptive. This will be needed in a later patch to access the
    PropertiesToolbar's back_button from within SnapshotsProperty.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710306

 data/ui/properties-toolbar.ui |    2 +-
 src/properties-toolbar.vala   |    2 ++
 2 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/data/ui/properties-toolbar.ui b/data/ui/properties-toolbar.ui
index b16a6af..6fd02a3 100644
--- a/data/ui/properties-toolbar.ui
+++ b/data/ui/properties-toolbar.ui
@@ -9,7 +9,7 @@
     </style>
 
     <child>
-      <object class="GtkButton" id="back">
+      <object class="GtkButton" id="back_button">
         <property name="visible">True</property>
         <property name="valign">center</property>
         <signal name="clicked" handler="on_back_clicked"/>
diff --git a/src/properties-toolbar.vala b/src/properties-toolbar.vala
index dced377..d59a103 100644
--- a/src/properties-toolbar.vala
+++ b/src/properties-toolbar.vala
@@ -4,6 +4,8 @@ using Gtk;
 [GtkTemplate (ui = "/org/gnome/Boxes/ui/properties-toolbar.ui")]
 private class Boxes.PropertiesToolbar: HeaderBar {
     [GtkChild]
+    public Gtk.Button back_button;
+    [GtkChild]
     private Image back_image;
     [GtkChild]
     private EditableEntry title_entry;