Hi, the default Gtk::Expander works nicely
http://ruby-gnome2.sourceforge.jp/hiki.cgi?Gtk%3A%3AExpander
But is there a way to use different images than the default one,
specifically a [+] icon and a [-] icon? I am asking because in some
applications i see a + icon, which expands some kind of treeview below
it, and the + icon then becomes a - icon, which about button press
action on it, closes that again.