OptionalContentGroup Property (PdfAnnotation)
Gets or sets the optional content group, which specifies the optional content properties of the annotation.
Before the annotation is drawn, annotation visibility is determined based on this property as well as the annotation flags specified in the Flags property. If annotation is determined to be invisible, the annotation is skipped, as if it were not in the document.
Target Platforms: .NET9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5