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 horizontal division
See W(Paned) for details.
GTK2.Hpaned()->add1(GTK2.Label("Left\nSide\nOf\nPane"))->add2(GTK2.Label("Right\nSide\nOf\nPane"))->set_size_request(100,100)