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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