title: seekbar thumb position not equals progress
body: <p>I want to create seekbar with thumb which don't change progress. Progress in my seekbar must to setting separately from thumb position. How can I do it?</p>
  
  <p>I should say, I must to extends Seekbar and to override some methods. But I don't understand which??? Which method is determining position of thumb? And which is determining progress?</p>
  
  <pre><code>Please help me!!
  Thanks at advance!
  </code></pre>