The YOffset has a dual purpose depending on whether or not it is set in
conjunction with a Y coordinate or a Height based field.
If set in conjunction with a Y coordinate then the affected region will be
drawn from that Y coordinate up to the height of the container, minus the
value given in the YOffset. This means that the height of the region is
dynamically calculated in relation to the height of the container.
If the YOffset field is set in conjunction with a fixed or relative height
then the region will be drawn from a vertical coordinate calculated from the
formula "YCoord = ContainerHeight - ColourHeight - YOffset".
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