ScrollBox	A minimal composite widget that manages only two 
                scrollbars and a main window.

xscrollbox	a simple version of xbitmap that tests ScrollBox.

BUG: for some unknown reason, the borders in the children of
xscrollbox are modified.

BUGS: the handling of the Motif Scrollbars is not quite correct
or complete.  For real examples of using it, see Volume 6 and
the associated examples.
