warning while executing gtk_widget_draw

Hello,

I have written one program and I am seeing the following warning:

Gtk-CRITICAL **: gtk_widget_draw: assertion '!widget->priv->alloc_needed'
failed

program is as follows:

main()
{
    GtkDrawingArea *statistics;
    cairo_surface_t *surface;
    cairo_t *cr;
    GtkWindow *main_window;


    gtk_init( NULL, NULL );
    statistics = (GtkDrawingArea*)gtk_drawing_area_new();
    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 120, 120);
    cr = cairo_create ( surface );
    gtk_widget_draw( (GtkWidget*)statistics, cr );
    cairo_surface_write_to_png( surface, "one.png" );
    main_window = (GtkWindow*)gtk_window_new(GTK_WINDOW_TOPLEVEL);

g_signal_connect(G_OBJECT(main_window),"destroy",G_CALLBACK(gtk_main_quit),NULL);
    gtk_container_add (GTK_CONTAINER (main_window),(GtkWidget*)statistics);
    gtk_widget_show_all((GtkWidget*)main_window);

    gtk_main();
}

can some one please tell me the problem in the above program ?

Thanks & Regards
--
Lokesh Chakka,
Mobile: 9731023458

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