🚀 go-pugleaf

Buenas.

Tengo un problemilla cuando intento pintar un rectangulo en un drawingarea, 
el codigo es el siguiente:

typedef struct {
        float r; //color rojo
        float g; //color verde
        float b; //color azul
} fcolor;
.....
.....
//Aqui creo el drawing area
drawingarea1 = gtk_drawing_area_new ();
  gtk_widget_ref (drawingarea1);
  gtk_object_set_data_full (GTK_OBJECT (Creador_de_texturas), 
"drawingarea1", drawingarea1,
                            (GtkDestroyNotify) gtk_widget_unref);
  gtk_widget_show (drawingarea1);
  gtk_table_attach (GTK_TABLE (table1), drawingarea1, 1, 2, 0, 1,
                    (GtkAttachOptions) (GTK_EXPAND | GTK_FILL),
                    (GtkAttachOptions) (GTK_FILL), 0, 0);
        
                                        
        color.r = texturas[textura].ambiente.r;
        color.g = texturas[textura].ambiente.g;
        color.b = texturas[textura].ambiente.b;
        pinta_rectangulo(drawingarea1,color);

......
......

//esta funci�n es la encargada de pintar el rectangulo

void pinta_rectangulo(GtkWidget *area,fcolor texcolor) {
        GdkGC *gc;
        GdkColor *color = NULL;
        GdkDrawable *drawable = NULL;
        
        /*
        Esta rutina la saque de:
        http://www.linuxlots.com/~barreiro/spanish/gtk/faq/x862.html
        */
        
        gc = gdk_gc_new(area->window);   //El error es al llamar al elemento window
        
        color = (GdkColor *)malloc(sizeof(GdkColor));   
        color->red =    texcolor.r * (65535/255);
        color->green =  texcolor.g * (65535/255);
        color->blue =   texcolor.b * (65535/255);
        
        color->pixel = (gulong)(texcolor.r*65536 + texcolor.g*256 + texcolor.b);
        
        gdk_color_alloc(gtk_widget_get_colormap(area), color);
        
        gdk_gc_set_foreground(gc, color);       
        
        drawable = area->window;
        gdk_draw_rectangle(drawable,gc,TRUE,0,0,
                        area->allocation.width,area->allocation.height);        
        return;
}


El error que me d� es el siguiente, y es al crear la ventana:

Gdk-CRITICAL **: file gdkgc.c: line 51 (gdk_gc_new_with_values): assertion 
`window != NULL' failed.

Gdk-CRITICAL **: file gdkgc.c: line 456 (gdk_gc_set_foreground): assertion 
`gc != NULL' failed.

Gdk-CRITICAL **: file gdkdraw.c: line 89 (gdk_draw_rectangle): assertion 
`drawable != NULL' failed.