GtkVBox A vertical container box GtkVBox is a container that organizes child widgets into a single column. Use the #GtkBox packing interface to determine the arrangement, spacing, height, and alignment of GtkVBox children. All children are allocated the same width. #GtkHBox a sister class that organizes widgets into a row. Creates a new GtkVBox. @homogeneous: %TRUE if all children are to be given equal space allotments. @spacing: the number of pixels to place by default between children. @Returns: a new GtkVBox.