Specifies when to activate 3D and rich media annotations.
public enum PdfRichMediaActivationMode
ExplicitActivation = 2
Keeps the annotation inactive until explicitly activated by a script or user action.
OnPageOpen = 0
Activates the annotation as soon as the page containing the annotation receives focus as the current page.
OnPageVisible = 1
Activates the annotation as soon as any part of the page containing the annotation becomes visible.
One example is in a multiple-page presentation. Only one page is the current page although several are visible.