title: Adding a second thumb to the slider control in WPF
body: <p>I am trying to make a range control which is basically a slider control with an extra thumb.  The only code I found for one already built is here.</p>
  
  <p><a href="http://www.codeplex.com/AvalonControlsLib" rel="nofollow noreferrer">http://www.codeplex.com/AvalonControlsLib</a></p>
  
  <p>For the life of me I cannot get a tooltip to show up above each thumb (with the current value) while it is being moved.  It will show a short mouse hover tooltip, but it disappears when the thumb is being moved.  Does anyone know anything about this particular control, or how you would add a second thumb to the slider control and use it the same way?  I've found this basic question on a few forums with no answer besides pointing to the above link.  Of course, people always mention how easy it is without showing or explaining how you would go about it.  Thanks in advance.</p>
  
  <p>Bob</p>