[gtkmm] demo: Update notebook's tabs style

[Juan R. Garcia Blanco <juanrgar src gnome org>]

commit 28e70d08bc838f269d5327780190c775c92dc52c
Author: Juan R. García Blanco <juanrgar gmail com>
Date:   Sun Jul 13 13:00:18 2014 +0200

    demo: Update notebook's tabs style
    
        * demos/gtk-demo/demowindow.cc: Set "tab-expand" child property
        of "Info" and "Source" tabs, as it is currently done in
        gtk3-demo.

 demos/gtk-demo/demowindow.cc |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/demowindow.cc b/demos/gtk-demo/demowindow.cc
index c55dfd7..f270fed 100644
--- a/demos/gtk-demo/demowindow.cc
+++ b/demos/gtk-demo/demowindow.cc
@@ -108,6 +108,8 @@ DemoWindow::DemoWindow()
   //Notebook:
   m_Notebook.append_page(m_TextWidget_Info, "_Info", true);  //true = use mnemonic.
   m_Notebook.append_page(m_TextWidget_Source, "_Source", true);  //true = use mnemonic.
+  m_Notebook.child_property_tab_expand(m_TextWidget_Info) = true;
+  m_Notebook.child_property_tab_expand(m_TextWidget_Source) = true;
   m_HBox.pack_start(m_Notebook);
 
   set_default_size (800, 600);