scrollF :: F b d -> F b d vScrollF :: F b d -> F b d hScrollF :: F b d -> F b d
scrollF fudget
scrollF shows a scrolling area with attached horizontal and
vertical scroll bars,
in which a fudget with a potentially very large window can be shown.
vScrollF shows a scrolling area with an attached vertical scroll bar,
in which a fudget with a potentially very tall window can be shown.
hScrollF shows a scrolling area with an attached horizontal scroll bar,
in which a fudget with a potentially very wide window can be shown.
fudget :: F b d
