You can find the RadMediaPlayers help here. The "RadControls for Silverlight" ' s help is located here.
One of the key concepts in the RadMediaPlayer is that it is an ItemsControl that contains RadMediaItems and the the RadMediaItem wraps the System.Windows.Controls.MediaElement. This is crucial, for example if you wonder whether a specific format could be played in RadMediaPlayer, you have to check the RadMediaItem's supported formats.
Please let us know if you need further assistance.
All the best,
the Telerik team
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