How to read MetaData

Hello,
im trying to read some metadata which I add to the Media Element
e.g.
mediaElement.metadata.addValue("mediatitel", mediaList.media[i].mediatitel);
how can I read this Metadata when the media element is on the stage

Brian, Im doing following:
                    var imageResource:URLResource = new URLResource(mediaList.media[i].@url);
                    var mediaElement:MediaElement = factory.createMediaElement(imageResource);
                    var metaData:Metadata = new Metadata();
                    metaData.addValue("mediatitel", mediaList.media[i].@mediatitel);
                    mediaElement.addMetadata("mediaInfos",metaData);
then I add the Image Element to a serial Element
then
            mediaElement.addEventListener(MediaElementEvent.METADATA_ADD,onMetadataAdd);
this event is never fired.
when I want to read the metadata on the displayobjectchange event
var metadata:Metadata = mediaElement.getMetadata("MediaInfos");
trace(metadata.getValue("mediatitel");
I got the metadata but not the one for the right element.

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Thanks

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