From Tracker Software PDF SDK
The event is fired when the document's properties are being changed.
|Param1||PARAM_T||The PXV_ChangeDocPropsFlag are specified here that indicate which properties were changed.|
|Handled||VARIANT_BOOL||Specifies whether the event was handled. Marking the event as handled will cause the event sender to look at the event`s result and act accordingly based on the event type.|
|Result||PARAM_T||Specifies the result that will be used by the event sender when the event is marked as Handled.|