pege properties-on timer
ScrollBar.SetScrollBarPos("scrollbar", cc, false);
mediaplayer
Page.StartTimer(100);
result = MediaPlayer.GetLength("mediaplayer");
ScrollBar.SetRange("scrollbar", 0, result, 0);
scrollbar
result = ScrollBar.GetScrollBarPos("scrollbar");
MediaPlayer.Seek("mediaplayer", SEEK_SPECIFIC, result);