Hello Mick ,
What is the error that you receive ? Have you tried this with Silverlight's MediaElement only, instead of using the RadMediaPlayer. Basically, the RadMediaPlayer contains collection of RadMediaItems and every MediaItem actually wraps MediaElement. In other words, if anything is possible with the MediaElement, it will be possible with the MediaPlayer too.
Any additional information on your scenario will be helpful. Thank you in advance.
the Telerik team
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