FormXObject BBox Property. The rect defining the bounding box of the graphic. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page BBox Property Type Default Value Read Only Description [C#] XRect [Visual Basic] XRect n/a No The rect defining the bounding box of the graphic Notes The rect defining the bounding box of the graphic. Content will be clipped to this area. Example None. previous page start next page