nsOrientation() to control this behavior. A separator
can be placed above the button box (or to the left when the button box
is at the right edge).
</p>
<p>
<b>Standard compliance:</b>\n
</p>
<p>
The marginHint() and spacingHint() sizes shall be used
whenever you lay out the interior of a dialog. One special note. If
you make your own action buttons (OK, Cancel etc), the space
between the buttons shall be spacingHint(), whereas the space
above, below, to the right and to the left shall be marginHint().
If y