Gtk2::ImageView::ScrollWin provides a widget similar in appearance to Gtk2::ScrollWin that is more suitable for displaying Gtk2::ImageView's.
The widget is built using four subwidgets arranged inside a Gtk2::Table with two columns and two rows.
one navigator button (the decorations) and one Gtk2::ImageView.
When the Gtk2::ImageView fits inside the window,
the decorations are hidden.