Annotation Focus Function. Prepare document for drawing at the annotation location. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Focus Function Prepare document for drawing at the annotation location Syntax [C#] bool Focus() [Visual Basic] Function Focus() As Boolean Params Name Description return True if the focus operation was successful. Notes Use this method to focus on the Annotation. This prepares the document for drawing at the Annotation location. If the operation was successful then the function returns true. If not then it will return false. The Doc.Page, Doc.Rect and Doc.Transform may all be changed as a result of calling this method. Example None. previous page start next page