title: Seek bar, change path color from yellow to white
body: <p>I have two questions:</p>
  
  <p>1) how do I change the color of the seek bar (path) from yellow (the default color) to white. What I mean to say is, while I slide the thumb , it turns the line traversed from grey to yellow.  I want track/line to either remain grey or white..Basically I want just the thumb to move with no color change in the seek bar.</p>
  
  <p>2)
  How to change the thumb of seekbar from rectangle to circle/sphere/round shape. </p>
  
  <p>any pointers will be appreciated. </p>