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Represents a collection of TimelineMarker objects.
You cannot set the TimelineMarkerCollection object in initial XAML or with the XAML used for the CreateFromXaml method. Instead, you either embed the timeline markers in the media itself or add them with script after the media is opened.
Changing the collection with script does not affect the embedded markers that exist in the media file; it only adjusts the current MediaElement representation of the collection of timeline markers.