GtkHScrollbar
A horizontal scrollbar
The HScrollbar widget is a widget arranged horizontally creating a scroll
bar. See #GtkScrollbar for details on scrollbars. #GtkAdjustment pointers may be
added to handle the adjustment of the scrollbars or it may be left NULL in which
case one will be created you. See #GtkAdjustment for details.
The #GtkHScrollbar struct contains private data and should be accessed
unsing the functions below.
Creates a new horizontal scrollbar.
@adjustment:
@Returns: the new GTKHScrollbar