MarkerReached is not firing for captions in dfxp files.
After some research I added the following code to capture the MarkerReached and MarkerLeft events for TimedTextElement captions, just like in the CaptionBlockRegion() constructor.
The events never fires. It would be really important for me since I need to relay the captions to a different control than the SMF caption block region.
_captionManager = new MediaMarkerManager<TimedTextElement>()
SeekingSearchWindow = TimeSpan.FromMilliseconds(DefaultMaximumCaptionSeekSearchWindowMillis)
_captionManager.MarkerLeft += (s, c) => CaptionManager_MarkerLeft(c);
_captionManager.MarkerReached += (s, c, f) => CaptionManager_MarkerReached(c);