maybe enable feature to show stats...
yourPLAYER.PlayerGraphVisibility = Microsoft.SilverlightMediaFramework.Core.FeatureVisibility.Visible;
There are several more you can show as well but this one is used to see the framerate... I think... the property must be in the source for this somewhere if you need to access the value programatically
May not be what your looking for but it can be shown to see what the player is playing....