[gnome-hispano] pasar parametro con g_signal_connect()

[Chÿffffffffffe1vez Gallardo Vÿffffffffffedctor Vladimi <vivlachaga yahoo com mx>]

Hola, tengo una ligera duda

tengo el siguiente código
====================================================================
mainIcon = gtk_status_icon_new_from_file(icon_filename);

GtkWidget *menu_popup;
menu_popup = glade_xml_get_widget(xml, "main_menu");
gtk_menu_popup(GTK_MENU(menu_popup) , NULL, NULL, NULL, NULL, 0,0);
====================================================================

mi menu contextual es desplegado correctamente, pero si lo mando mediante parametro a un callback me da 
segfault
con gdb veo que es problema de "casting", pero no me queda claro el concepto

codigo erroneo
=====================================================================
void tray_icon_button_press (GtkWidget *widget, GtkWidget *menu)
{
    gtk_menu_popup( GTK_MENU (menu) , NULL, NULL, NULL, NULL, 0, 0);    
}

mainIcon = gtk_status_icon_new_from_file(icon_filename);

GtkWidget *menu_popup;
menu_popup = glade_xml_get_widget(xml, "main_menu");
g_signal_connect(G_OBJECT(mainIcon), "popup-menu", G_CALLBACK(tray_icon_button_press), menu_popup );
====================================================================================================

doy click derecho sobre mi iconito y plop!, no entiendo como estoy pasando mal el data del signalconnect

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb718e920 (LWP 15924)]
0xb76bee98 in g_type_check_instance_cast () from /usr/lib/libgobject-2.0.so.0

podrían ayudarme?

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