gtk_signal_connect()

[XinKai Wang <xkwang krdl org sg>]

I used a GtkPixmap in my application.  I want to implement a pop-up
menu for this pixmap(to popup a menu when click right button on the
pixmap).  
But I noticed that the 

gtk_signal_connect_object(GTK_OBJECT(pixmap), "event",GTK_SIGNAL_FUNC
(button_press_callback), GTK_OBJECT(pop_up_menu));

does not work.  There is no error messages but no any callbacks at all.
"event" is a signal of GtkWidget and GtkPixmap is a subclass of
GtkWidget.
So why? And how can I implement this kind of functions?

thanks.
-- 
 
 No brain, no pain.