[Jderobot] Error con GTK al generar canvas

[vnieto]

Hola,
Estoy intentando utilizar canvas de la clase Gtk::DrawingArea, siguiendo el
código de introrob. El problema es que me muestra un error en ejecución y no
me muestra nada en la ventana. Os enseño el código y el error:

#include "gui.h"

namespace componente {

	Gui::Gui(Api *api) : gtkmain(0, 0) {
		this->api = api;
		
		//Inicializaciones
		/*Init OpenGL*/
        if (!Gtk::GL::init_check(NULL, NULL)) {
            std::cerr << "Couldn't initialize GL\n";
            std::exit(1);
        }
        Gnome::Canvas::init();
		
		std::cout << "Loading glade\n";
		refXml = Gnome::Glade::Xml::create("./componentegtk.glade");

		
		//Get widgets       
                refXml->get_widget("secondarywindow", secondarywindow);
                refXml->get_widget("label1", label1);
                refXml->get_widget("label2", label2);
                refXml->get_widget("boton1", boton1);
                refXml->get_widget("canvas1", canvas1);
        
        //Eventos
		boton1->signal_clicked().connect(sigc::mem_fun(this,
&Gui::boton1_clicked));
		
		
		
		//Inicializacon Drawarea
		canvas1->signal_unrealize();
		canvas1->signal_realize();
		canvas1->set_child_visible(TRUE);
		gc_laser = Gdk::GC::create(canvas1->get_window());
		
		colormap = canvas1->get_colormap();
		color_white = Gdk::Color("#FFFFFF");
                color_black = Gdk::Color("#000000");
                color_red = Gdk::Color("#FF0000");
                colormap->alloc_color(color_white);
                colormap->alloc_color(color_black);
                colormap->alloc_color(color_red);
		
		secondarywindow->show();
	}
	
	
	void Gui::display() {		
		
		gc_laser->set_foreground(color_black);
                canvas1->get_window()->draw_rectangle(gc_laser, true, 0, 0,
360, 180);
                gc_laser->set_foreground(color_red);
                canvas1->get_window()->draw_line(gc_laser, 180, 165, 180,
180);
                gc_laser->set_foreground(color_white);
        
		
		while (gtkmain.events_pending())
                          gtkmain.iteration();
 
	}
	
	void Gui::boton1_clicked() {
		label2->set_text("Me han pulsadooo");
	}

}



La salida del error es:

Loading glade

(componente:2422): Gdk-CRITICAL **: IA__gdk_gc_new: assertion `drawable !=
NULL' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_ref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): Gdk-CRITICAL **: IA__gdk_gc_set_foreground: assertion
`GDK_IS_GC (gc)' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_ref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): Gdk-CRITICAL **: IA__gdk_draw_rectangle: assertion
`GDK_IS_GC (gc)' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): Gdk-CRITICAL **: IA__gdk_gc_set_foreground: assertion
`GDK_IS_GC (gc)' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_ref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): Gdk-CRITICAL **: IA__gdk_draw_line: assertion `GDK_IS_GC
(gc)' failed

(componente:2422): GLib-GObject-CRITICAL **: g_object_unref: assertion
`G_IS_OBJECT (object)' failed

(componente:2422): Gdk-CRITICAL **: IA__gdk_gc_set_foreground: assertion
`GDK_IS_GC (gc)' failed



Un saludo!



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