GtkCList::set_shadow_type
    
     Set the outer border (shadow) of the widget. The whole widget is surrounded with a special
     border, which can look flat, inset or outset.     
    
    
     You can best see the effect when you add the following lines to the example given in
     the constructor:
     
$scrolled_win->set_border_width( 10);
$list->set_shadow_type( GTK_SHADOW_ETCHED_OUT);
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