GtkVBox is a box container that packs child
widgets in a single column, using the packing methods inherited from
GtkBox, such as
pack_start() , as well as the less
flexible add() method available
to most container widgets.
Note that all children in a GtkVBox are allocated
the same width, regardless of settings and child requisition size.
Widgets taking up less than the allocated width are by default centered
within the available area in that dimension.
See also: GtkContainer,
GtkBox, GtkHBox,
GtkButtonBox, GtkTable.
