[gtkmm-documentation] FlowBox example: Use Gtk::manage().

[Murray Cumming <murrayc src gnome org>]

commit 3d39c526fd8c27dc9758d200e9dde07b958f1663
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Apr 9 09:22:32 2014 +0200

    FlowBox example: Use Gtk::manage().
    
    * examples/book/flowbox/examplewindow.[h|cc]: This is simpler
      than storing the widget pointers and deleting them later.

 examples/book/flowbox/examplewindow.cc |   20 ++------------------
 examples/book/flowbox/examplewindow.h  |    5 -----
 2 files changed, 2 insertions(+), 23 deletions(-)
---
diff --git a/examples/book/flowbox/examplewindow.cc b/examples/book/flowbox/examplewindow.cc
index 523b2f6..3269a7d 100644
--- a/examples/book/flowbox/examplewindow.cc
+++ b/examples/book/flowbox/examplewindow.cc
@@ -48,29 +48,13 @@ ExampleWindow::ExampleWindow()
 
 ExampleWindow::~ExampleWindow()
 {
-  while(!m_color_swatches.empty())
-  {
-    Gtk::Button* color_swatch = m_color_swatches.back();
-    delete color_swatch;
-    m_color_swatches.pop_back();
-  }
-
-  while(!m_color_drawing_areas.empty())
-  {
-    Gtk::DrawingArea* drawing_area = m_color_drawing_areas.back();
-    delete drawing_area;
-    m_color_drawing_areas.pop_back();
-  }
 }
 
 Gtk::Button* ExampleWindow::create_color_swatch(int swatch_i)
 {
   Gdk::RGBA rgba(m_color_names[swatch_i]);
-  Gtk::DrawingArea* drawing_area = new Gtk::DrawingArea();
-  Gtk::Button* color_swatch = new Gtk::Button();
-
-  m_color_drawing_areas.push_back(drawing_area);
-  m_color_swatches.push_back(color_swatch);
+  Gtk::DrawingArea* drawing_area = Gtk::manage(new Gtk::DrawingArea());
+  Gtk::Button* color_swatch = Gtk::manage(new Gtk::Button());
 
   drawing_area->set_size_request(24, 24);
   drawing_area->override_background_color(rgba);
diff --git a/examples/book/flowbox/examplewindow.h b/examples/book/flowbox/examplewindow.h
index 045443f..1d335d8 100644
--- a/examples/book/flowbox/examplewindow.h
+++ b/examples/book/flowbox/examplewindow.h
@@ -28,11 +28,6 @@ public:
   virtual ~ExampleWindow();
 
 protected:
-  // Slots
-
-  // Widgets
-  std::vector<Gtk::Button*> m_color_swatches;
-  std::vector<Gtk::DrawingArea*> m_color_drawing_areas;
 
   // Containers
   Gtk::ScrolledWindow m_scrolled_window;