This property reflects the position and area of the field on the
page.
This property is only valid if the fields has one single visible
appearance on the page. If you are unsure whether your field will
always map to one visible appearance it is better to call GetAnnotations and work with
the Annotation.Rect of
each of the items in the array. If there is only one item in the
array then this indicates that the field has one one single visible
appearance on the page.
The most common case in which a field does not have a single
visible appearance is in the case of radio buttons. In this case
the field describes the radio button group and the children of the
field are the visible buttons. Be aware that it is possible to
spread radio buttons across more than one page.
This rectangle will be empty if the field does not have one
single visible appearance on the page.
This property must always have a value. Attempting to assign a
null value to this property will result in a NullReferenceException
being thrown.
If this field has no visible appearance, attempting to assign a
value will result in an ArgumentOutOfRangeException being
thrown.
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