addZone(startValue, endValue, color [, label ])

Adds a zone to the meter.

Argument	Default	Description
startValue	(Mandatory)	The start value (the lower bound) for the zone.
endValue	(Mandatory)	The end value (the upper bound) for the zone.
color	(Mandatory)	The color of the zone.
label	""	The text to be put at the center of the zone.

A TextBox object representing the label. This may be used to fine-tune the appearance of the label.