ProgressBar not visible when video is buffering

Topics: Windows Phone 8
Oct 3, 2013 at 8:44 AM
Edited Oct 3, 2013 at 1:14 PM
Hi I am using this code
      <mmppf:MediaPlayer 
        Source="http://ecn.channel9.msdn.com/o9/content/smf/smoothcontent/bbbwp7/big buck bunny.ism/manifest">
            <mmppf:MediaPlayer.Plugins>
                <adaptive:AdaptivePlugin />
            </mmppf:MediaPlayer.Plugins>
        </mmppf:MediaPlayer>
When I seek the slider, the video buffering progressbar is not showing up.Anybody have this issue?