void PlaybackController_OnProgress(object sender, PlaybackStateEventArgs e)
{
if (!UpdatePosition(e.Title, e.Position))
{
PlaybackController.OnProgress -= new EventHandler<PlaybackStateEventArgs>(PlaybackController_OnProgress);
}
}
void ExternalItem_OnProgress(object sender, PlaybackStateEventArgs e)
{
//do nothing - we are used when something is already playing when we are created
}