[GtkGLExt] gtkglextmm + glade 3 + gtkbuilder...something must be missing on my code

[Cristobal Navarro <axischire gmail com>]

hello,

i am having trouble with linking my OpenGL Scene with a Drawing area coming from glade3.
im using gtkbuilder to read the GUI from c++ code.

it is working for buttons and related events, but not for the inherited events that my GLWindow class implements.


this is my GLWindow class

------------------CODE--START
//
//  OpenGL scene.
//
class GLWindow : public Gtk::DrawingArea, public Gtk::GL::Widget<GLWindow>{
public:
  GLWindow(BaseObjectType* baseObject, Glib::RefPtr<Gtk::Builder>& refBuilder);

  virtual ~GLWindow();
  bool draw();

protected:
  virtual void on_realize();
  virtual bool on_configure_event(GdkEventConfigure* event);
  virtual bool on_expose_event(GdkEventExpose* event);

};

//draw method, custom
bool GLWindow::draw(){
    // force our program to redraw the entire clock.
    Glib::RefPtr<Gdk::Window> win = get_window();
    if (win){
        Gdk::Rectangle r(0, 0, get_allocation().get_width(),

                get_allocation().get_height());
        win->invalidate_rect(r, false);
    }
    return true;
}
---------------------CODE--END

the other three virtual methods are the default implemented ones that come in the examples (simple.cc)

next,  my mainWindow class, where i setup opengl this way.

--------------------CODE--START
void Application::init(Glib::RefPtr<Gtk::Builder> refBuilder){
    //Get the GtkBuilder-instantiated Button, and connect a signal handler:

    quitButton = 0;

    refBuilder->get_widget("buttonExit", quitButton);
    if(quitButton){
      quitButton->signal_clicked().connect( sigc::mem_fun(*this, &Application::on_button_quit_clicked) );

    }
    refBuilder->get_widget_derived("glWindow", myGL );
    if(myGL){
        printf("GL Initialized\n");
    }
    myGL->draw();
}
--------------------CODE--END


when i run the program, the drawing window remains gray, nothing is drawn....
what am i doing wrong??

if you need the whole source code for testing i can upload it
any help is welcome




Cristobal