[gtkmm] Change cursor in Widget



Hi, I'm trying to change the cursor over one window. I'm using this simple 
code, but it segfaults:

#include <gtkmm/window.h>
#include <gtkmm/main.h>
#include <gdkmm/cursor.h>

int main (int argc,char **argv){
        Gtk::Main app(argc,argv);
        Gtk::Window window;
        Gdk::Cursor cursor(Gdk::STAR);
        window.get_window()->set_cursor(cursor);
        app.run(window);
        return 0;
}

Is this the way to change the cursor? I'm using 
gtkmm-2.0.2

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                 Sergio Pascual Ramírez       spr astrax fis ucm es
               Tf: (+34)  91-394-50-18      Fax: (+34)  91-394-46-35
                      Dept. Astrofísica Facultad de C.C. Físicas 
                          Universidad Complutense de Madrid
                                 28040 Madrid (Spain)
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            Spanish junior researchers fight for employment rights 
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