Determined by `label. If this attribute is null,
the symbolic indices of the underlying slotfiller are used, as characters, without the
backquotes; a symbolic index is likewise used for an individual label that is null in
If a value is a character matrix, its ravel is used; if perchance a nested array is
specified, the specifying A+ expression is shown.
Labels are always left justified. Since the
choice shown in the
value area is always centered, this item in the
menu may not be horizontally aligned with it.
The label font is `labelfont if that is non-null, else
kaplgallant (more precisely, the value of s.FONT).
It does not follow `font.
The label color is `labelfg if that is non-null, else
black (more precisely, the value of s.BLACK). It
does not follow `fg.