The paned window widgets are useful when you want to divide an area
into two parts, with the relative size of the two parts controlled
by the user. A groove is drawn between the two portions with a
handle that the user can drag to change the ratio. This widgets
makes a vertical division
GTK.Vpaned()->add1(GTK.Label("Top Side Of Pane"))->add2(GTK.Label("Bottom"))->set_usize(100,100)