Index of Box functionality.

hbox  :: [DisplayHandle] -> DisplayHandle
vbox  :: [DisplayHandle] -> DisplayHandle
phbox :: Geometry -> [DisplayHandle] -> DisplayHandle
pvbox :: Geometry -> [DisplayHandle] -> DisplayHandle

mkHBox :: [DisplayHandle]    -> IO (Box, DisplayHandle)
mkVBox :: [DisplayHandle]    -> IO (Box, DisplayHandle)
mkPHBox :: Geometry -> [DisplayHandle] -> IO (Box, DisplayHandle)
mkPVBox :: Geometry -> [DisplayHandle] -> IO (Box, DisplayHandle)

mkBox :: BoxType -> [DisplayHandle] -> IO (Box, DisplayHandle)

getBoxElements    :: Box -> IO [DisplayHandle]
setBoxElements    :: Box -> [DisplayHandle] -> IO ()
addBoxWidgetFront :: Box -> DisplayHandle   -> IO ()
addBoxWidgetBack  :: Box -> DisplayHandle   -> IO ()

getBoxType        :: Box -> IO BoxType
setBoxType        :: Box -> BoxType -> IO ()