Most packing is done by creating boxes. These are invisible widget
containers that we can pack our widgets into which come in two
forms, a horizontal box, and a vertical box. This is the vertical
one. When packing widgets into a vertical box, the objects are
inserted horizontally from top to bottom or bottom to top depending
on the call used.
GTK.Vbox(0,0)->add(GTK.Button("Hello"))->add(GTK.Button("World"))->pack_end_defaults(GTK.Button("From right"))->pack_start_defaults(GTK.Button("From left"))
GTK.Vbox(1,0)->add(GTK.Button("Hello"))->add(GTK.Button("World"))->pack_end_defaults(GTK.Button("From right"))->pack_start_defaults(GTK.Button("From left"))
GTK.Vbox(1,40)->add(GTK.Button("Hello"))->add(GTK.Button("World"))->pack_end_defaults(GTK.Button("From right"))->pack_start_defaults(GTK.Button("From left"))
GTK.Tooltips()->set_tip()