 -- Class: <gtk-hscrollbar>
     Derives from <gtk-scrollbar>.

     This class defines no direct slots.

 -- Function: gtk-hscrollbar-new (adjustment <gtk-adjustment>) =>  (ret <gtk-widget>)
     Creates a new horizontal scrollbar.

     adjustment
          the <gtk-adjustment> to use, or #f to create a new adjustment.

     ret
          the new <gtk-hscrollbar>.