By default, Track View shows curves for all animated tracks of all selected objects. You can use Isolate Curve to temporarily display only curves with one or more keys selected. When many curves are visible in the Keys window, use this command to simplify the display temporarily. 
  
 
To turn off Isolate Curve, invoke the command again or simply highlight a different track in the Controller window.
To use Isolate Curve
Now you can see only curves that contain one or more selected keys.