If you set an empty AnnPicture, this AnnFreehandHotspotObject will use the picture defined in DefaultPicture property.
If this property has a valid image, the AnnFreehandHotspotObject will use the image to fill its area.
If this property does not have a valid image, the AnnFreehandHotspotObject will use DefaultPicture to determine the image to fill its area.
For more information, refer to Using Pictures in Annotation Objects.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2