How to capture the scroll event of the scrolled window?

[heavenscape <masonduan1 sina com>]

I need to track the scroll events of the GtkScrolledWindow, and i use
following code: 
	GtkWidget* w = lookup_widget(MainWnd,"scrolledwindow1");
	gtk_widget_add_events (w, GDK_SCROLL_MASK);

and I mapped the scroll child event with glade, but it does not work. 
Anyone knows why?
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