Vertical box container.
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.
GtkVBox ([bool homogeneous = false , [int spacing = 0 ]]);-- Creates a container for a single column of child widgets.